diff --git a/package-lock.json b/package-lock.json
index 1ef44d5..52066ac 100644
--- a/package-lock.json
+++ b/package-lock.json
@@ -1,6 +1,6 @@
 {
   "name": "node-datahub",
-  "version": "4.2.2",
+  "version": "4.5.0",
   "lockfileVersion": 1,
   "requires": true,
   "dependencies": {
@@ -10,6 +10,15 @@
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       "dev": true
     },
+    "accepts": {
+      "version": "1.3.8",
+      "resolved": "https://registry.npmjs.org/accepts/-/accepts-1.3.8.tgz",
+      "integrity": "sha512-PYAthTa2m2VKxuvSD3DPC/Gy+U+sOA1LAuT8mkmRuvw+NACSaeXEQ+NHcVF7rONl6qcaxV3Uuemwawk+7+SJLw==",
+      "requires": {
+        "mime-types": "~2.1.34",
+        "negotiator": "0.6.3"
+      }
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       "resolved": "https://registry.npmjs.org/ansi-regex/-/ansi-regex-2.1.1.tgz",
@@ -22,6 +31,11 @@
       "integrity": "sha1-tDLdM1i2NM914eRmQ2gkBTPB3b4=",
       "dev": true
     },
+    "array-flatten": {
+      "version": "1.1.1",
+      "resolved": "https://registry.npmjs.org/array-flatten/-/array-flatten-1.1.1.tgz",
+      "integrity": "sha512-PCVAQswWemu6UdxsDFFX/+gVeYqKAod3D3UVm91jHwynguOwAvYPhx8nNlM++NqRcK6CxxpUafjmhIdKiHibqg=="
+    },
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       "resolved": "https://registry.npmjs.org/asn1/-/asn1-0.2.3.tgz",
@@ -506,7 +520,8 @@
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               "version": "2.1.1",
               "bundled": true,
-              "dev": true
+              "dev": true,
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@@ -557,7 +572,8 @@
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               "version": "0.4.2",
               "bundled": true,
-              "dev": true
+              "dev": true,
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@@ -572,6 +588,7 @@
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               "bundled": true,
               "dev": true,
+              "optional": true,
               "requires": {
                 "inherits": "2.0.3"
               }
@@ -580,6 +597,7 @@
               "version": "2.10.1",
               "bundled": true,
               "dev": true,
+              "optional": true,
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               }
@@ -588,6 +606,7 @@
               "version": "1.1.7",
               "bundled": true,
               "dev": true,
+              "optional": true,
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@@ -596,7 +615,8 @@
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               "version": "1.0.0",
               "bundled": true,
-              "dev": true
+              "dev": true,
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@@ -613,12 +633,14 @@
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               "version": "1.1.0",
               "bundled": true,
-              "dev": true
+              "dev": true,
+              "optional": true
             },
             "combined-stream": {
               "version": "1.0.5",
               "bundled": true,
               "dev": true,
+              "optional": true,
               "requires": {
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               }
@@ -626,22 +648,26 @@
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               "version": "0.0.1",
               "bundled": true,
-              "dev": true
+              "dev": true,
+              "optional": true
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               "version": "1.1.0",
               "bundled": true,
-              "dev": true
+              "dev": true,
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               "version": "1.0.2",
               "bundled": true,
-              "dev": true
+              "dev": true,
+              "optional": true
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             "cryptiles": {
               "version": "2.0.5",
               "bundled": true,
               "dev": true,
+              "optional": true,
               "requires": {
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               }
@@ -681,7 +707,8 @@
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               "version": "1.0.0",
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-              "dev": true
+              "dev": true,
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@@ -713,7 +740,8 @@
             "extsprintf": {
               "version": "1.0.2",
               "bundled": true,
-              "dev": true
+              "dev": true,
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@@ -735,12 +763,14 @@
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               "version": "1.0.0",
               "bundled": true,
-              "dev": true
+              "dev": true,
+              "optional": true
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             "fstream": {
               "version": "1.0.11",
               "bundled": true,
               "dev": true,
+              "optional": true,
               "requires": {
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                 "inherits": "2.0.3",
@@ -796,6 +826,7 @@
               "version": "7.1.2",
               "bundled": true,
               "dev": true,
+              "optional": true,
               "requires": {
                 "fs.realpath": "1.0.0",
                 "inflight": "1.0.6",
@@ -808,7 +839,8 @@
             "graceful-fs": {
               "version": "4.1.11",
               "bundled": true,
-              "dev": true
+              "dev": true,
+              "optional": true
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             "har-schema": {
               "version": "1.0.5",
@@ -836,6 +868,7 @@
               "version": "3.1.3",
               "bundled": true,
               "dev": true,
+              "optional": true,
               "requires": {
                 "boom": "2.10.1",
                 "cryptiles": "2.0.5",
@@ -846,7 +879,8 @@
             "hoek": {
               "version": "2.16.3",
               "bundled": true,
-              "dev": true
+              "dev": true,
+              "optional": true
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               "version": "1.1.1",
@@ -863,6 +897,7 @@
               "version": "1.0.6",
               "bundled": true,
               "dev": true,
+              "optional": true,
               "requires": {
                 "once": "1.4.0",
                 "wrappy": "1.0.2"
@@ -871,7 +906,8 @@
             "inherits": {
               "version": "2.0.3",
               "bundled": true,
-              "dev": true
+              "dev": true,
+              "optional": true
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             "ini": {
               "version": "1.3.4",
@@ -883,6 +919,7 @@
               "version": "1.0.0",
               "bundled": true,
               "dev": true,
+              "optional": true,
               "requires": {
                 "number-is-nan": "1.0.1"
               }
@@ -896,7 +933,8 @@
             "isarray": {
               "version": "1.0.0",
               "bundled": true,
-              "dev": true
+              "dev": true,
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@@ -969,12 +1007,14 @@
             "mime-db": {
               "version": "1.27.0",
               "bundled": true,
-              "dev": true
+              "dev": true,
+              "optional": true
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             "mime-types": {
               "version": "2.1.15",
               "bundled": true,
               "dev": true,
+              "optional": true,
               "requires": {
                 "mime-db": "1.27.0"
               }
@@ -983,6 +1023,7 @@
               "version": "3.0.4",
               "bundled": true,
               "dev": true,
+              "optional": true,
               "requires": {
                 "brace-expansion": "1.1.7"
               }
@@ -990,12 +1031,14 @@
             "minimist": {
               "version": "0.0.8",
               "bundled": true,
-              "dev": true
+              "dev": true,
+              "optional": true
             },
             "mkdirp": {
               "version": "0.5.1",
               "bundled": true,
               "dev": true,
+              "optional": true,
               "requires": {
                 "minimist": "0.0.8"
               }
@@ -1050,7 +1093,8 @@
             "number-is-nan": {
               "version": "1.0.1",
               "bundled": true,
-              "dev": true
+              "dev": true,
+              "optional": true
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             "oauth-sign": {
               "version": "0.8.2",
@@ -1068,6 +1112,7 @@
               "version": "1.4.0",
               "bundled": true,
               "dev": true,
+              "optional": true,
               "requires": {
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@@ -1097,7 +1142,8 @@
             "path-is-absolute": {
               "version": "1.0.1",
               "bundled": true,
-              "dev": true
+              "dev": true,
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             "performance-now": {
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@@ -1108,7 +1154,8 @@
             "process-nextick-args": {
               "version": "1.0.7",
               "bundled": true,
-              "dev": true
+              "dev": true,
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@@ -1146,6 +1193,7 @@
               "version": "2.2.9",
               "bundled": true,
               "dev": true,
+              "optional": true,
               "requires": {
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@@ -1190,6 +1238,7 @@
               "version": "2.6.1",
               "bundled": true,
               "dev": true,
+              "optional": true,
               "requires": {
                 "glob": "7.1.2"
               }
@@ -1197,7 +1246,8 @@
             "safe-buffer": {
               "version": "5.0.1",
               "bundled": true,
-              "dev": true
+              "dev": true,
+              "optional": true
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             "semver": {
               "version": "5.3.0",
@@ -1221,6 +1271,7 @@
               "version": "1.0.9",
               "bundled": true,
               "dev": true,
+              "optional": true,
               "requires": {
                 "hoek": "2.16.3"
               }
@@ -1254,6 +1305,7 @@
               "version": "1.0.2",
               "bundled": true,
               "dev": true,
+              "optional": true,
               "requires": {
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@@ -1264,6 +1316,7 @@
               "version": "1.0.1",
               "bundled": true,
               "dev": true,
+              "optional": true,
               "requires": {
                 "safe-buffer": "5.0.1"
               }
@@ -1278,6 +1331,7 @@
               "version": "3.0.1",
               "bundled": true,
               "dev": true,
+              "optional": true,
               "requires": {
                 "ansi-regex": "2.1.1"
               }
@@ -1292,6 +1346,7 @@
               "version": "2.2.1",
               "bundled": true,
               "dev": true,
+              "optional": true,
               "requires": {
                 "block-stream": "0.0.9",
                 "fstream": "1.0.11",
@@ -1347,7 +1402,8 @@
             "util-deprecate": {
               "version": "1.0.2",
               "bundled": true,
-              "dev": true
+              "dev": true,
+              "optional": true
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             "uuid": {
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@@ -1376,7 +1432,8 @@
             "wrappy": {
               "version": "1.0.2",
               "bundled": true,
-              "dev": true
+              "dev": true,
+              "optional": true
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@@ -1410,6 +1467,7 @@
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           "integrity": "sha1-gTg9ctsFT8zPUzbaqQLxgvbtuyg=",
           "dev": true,
+          "optional": true,
           "requires": {
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           }
@@ -1484,7 +1542,8 @@
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-          "dev": true
+          "dev": true,
+          "optional": true
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@@ -1514,7 +1573,8 @@
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           "integrity": "sha1-rEaBd8SUNAWgkvyPKXYMb/xiBsA=",
-          "dev": true
+          "dev": true,
+          "optional": true
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@@ -1530,6 +1590,7 @@
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           "integrity": "sha1-0Jb5JqPe1WAPP9/ZEZjLCIjC2GM=",
           "dev": true,
+          "optional": true,
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           "integrity": "sha1-u5NdSFgsuhaMBoNJV6VKPgcSTxE=",
-          "dev": true
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+          "optional": true
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           "integrity": "sha1-MeohpzS6ubuw8yRm2JOupR5KPGQ=",
           "dev": true,
+          "optional": true,
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@@ -1680,6 +1743,7 @@
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           "integrity": "sha1-GrKLVW4Zg2Oowab35vogE3/mrtk=",
           "dev": true,
+          "optional": true,
           "requires": {
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@@ -1866,13 +1930,15 @@
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           "integrity": "sha1-wkvOKig62tW8P1jg1IJJuSN52O8=",
-          "dev": true
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+          "optional": true
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           "integrity": "sha1-7wiaF40Ug7quTZPrmLT55OEdmQo=",
-          "dev": true
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+          "optional": true
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@@ -1894,7 +1960,8 @@
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-          "dev": true
+          "dev": true,
+          "optional": true
         },
         "set-immediate-shim": {
           "version": "1.0.1",
@@ -2954,6 +3021,11 @@
         "concat-map": "0.0.1"
       }
     },
+    "bytes": {
+      "version": "3.1.2",
+      "resolved": "https://registry.npmjs.org/bytes/-/bytes-3.1.2.tgz",
+      "integrity": "sha512-/Nf7TyzTx6S3yRJObOAV7956r8cr2+Oj8AC5dt8wSP3BQAoeX58NoHyCU8P8zGkNXStjTSi6fzO6F0pBdcYbEg=="
+    },
     "chai": {
       "version": "3.5.0",
       "resolved": "https://registry.npmjs.org/chai/-/chai-3.5.0.tgz",
@@ -3015,12 +3087,35 @@
       "integrity": "sha1-2Klr13/Wjfd5OnMDajug1UBdR3s=",
       "dev": true
     },
+    "content-disposition": {
+      "version": "0.5.4",
+      "resolved": "https://registry.npmjs.org/content-disposition/-/content-disposition-0.5.4.tgz",
+      "integrity": "sha512-FveZTNuGw04cxlAiWbzi6zTAL/lhehaWbTtgluJh4/E95DqMwTmha3KZN1aAWA8cFIhHzMZUvLevkw5Rqk+tSQ==",
+      "requires": {
+        "safe-buffer": "5.2.1"
+      }
+    },
+    "content-type": {
+      "version": "1.0.4",
+      "resolved": "https://registry.npmjs.org/content-type/-/content-type-1.0.4.tgz",
+      "integrity": "sha512-hIP3EEPs8tB9AT1L+NUqtwOAps4mk2Zob89MWXMHjHWg9milF/j4osnnQLXBCBFBk/tvIG/tUc9mOUJiPBhPXA=="
+    },
     "convert-source-map": {
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       "resolved": "https://registry.npmjs.org/convert-source-map/-/convert-source-map-1.5.1.tgz",
       "integrity": "sha1-uCeAl7m8IpNl3lxiz1/K7YtVmeU=",
       "dev": true
     },
+    "cookie": {
+      "version": "0.4.2",
+      "resolved": "https://registry.npmjs.org/cookie/-/cookie-0.4.2.tgz",
+      "integrity": "sha512-aSWTXFzaKWkvHO1Ny/s+ePFpvKsPnjc551iI41v3ny/ow6tBG5Vd+FuqGNhh1LxOmVzOlGUriIlOaokOvhaStA=="
+    },
+    "cookie-signature": {
+      "version": "1.0.6",
+      "resolved": "https://registry.npmjs.org/cookie-signature/-/cookie-signature-1.0.6.tgz",
+      "integrity": "sha512-QADzlaHc8icV8I7vbaJXJwod9HWYp8uCqf1xa4OfNu1T7JVxQIrUgOWtHdNDtPiywmFbiS12VjotIXLrKM3orQ=="
+    },
     "core-js": {
       "version": "2.5.3",
       "resolved": "https://registry.npmjs.org/core-js/-/core-js-2.5.3.tgz",
@@ -3040,7 +3135,6 @@
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-      "dev": true,
       "requires": {
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       }
@@ -3054,6 +3148,16 @@
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+      "version": "1.1.2",
+      "resolved": "https://registry.npmjs.org/depd/-/depd-1.1.2.tgz",
+      "integrity": "sha512-7emPTl6Dpo6JRXOXjLRxck+FlLRX5847cLKEn00PLAgc3g2hTZZgr+e4c2v6QpSmLeFP3n5yUo7ft6avBK/5jQ=="
+    },
+    "destroy": {
+      "version": "1.0.4",
+      "resolved": "https://registry.npmjs.org/destroy/-/destroy-1.0.4.tgz",
+      "integrity": "sha512-3NdhDuEXnfun/z7x9GOElY49LoqVHoGScmOKwmxhsS8N5Y+Z8KyPPDnaSzqWgYt/ji4mqwfTS34Htrk0zPIXVg=="
+    },
     "detect-indent": {
       "version": "4.0.0",
       "resolved": "https://registry.npmjs.org/detect-indent/-/detect-indent-4.0.0.tgz",
@@ -3063,6 +3167,16 @@
         "repeating": "2.0.1"
       }
     },
+    "ee-first": {
+      "version": "1.1.1",
+      "resolved": "https://registry.npmjs.org/ee-first/-/ee-first-1.1.1.tgz",
+      "integrity": "sha512-WMwm9LhRUo+WUaRN+vRuETqG89IgZphVSNkdFgeb6sS/E4OrDIN7t48CAewSHXc6C8lefD8KKfr5vY61brQlow=="
+    },
+    "encodeurl": {
+      "version": "1.0.2",
+      "resolved": "https://registry.npmjs.org/encodeurl/-/encodeurl-1.0.2.tgz",
+      "integrity": "sha512-TPJXq8JqFaVYm2CWmPvnP2Iyo4ZSM7/QKcSmuMLDObfpH5fi7RUGmd/rTDf+rut/saiDiQEeVTNgAmJEdAOx0w=="
+    },
     "es-abstract": {
       "version": "1.11.0",
       "resolved": "https://registry.npmjs.org/es-abstract/-/es-abstract-1.11.0.tgz",
@@ -3085,6 +3199,11 @@
         "is-symbol": "1.0.1"
       }
     },
+    "escape-html": {
+      "version": "1.0.3",
+      "resolved": "https://registry.npmjs.org/escape-html/-/escape-html-1.0.3.tgz",
+      "integrity": "sha512-NiSupZ4OeuGwr68lGIeym/ksIZMJodUGOSCZ/FSnTxcrekbvqrgdUxlJOMpijaKZVjAJrWrGs/6Jy8OMuyj9ow=="
+    },
     "escape-string-regexp": {
       "version": "1.0.5",
       "resolved": "https://registry.npmjs.org/escape-string-regexp/-/escape-string-regexp-1.0.5.tgz",
@@ -3097,321 +3216,64 @@
       "integrity": "sha1-Cr9PHKpbyx96nYrMbepPqqBLrJs=",
       "dev": true
     },
+    "etag": {
+      "version": "1.8.1",
+      "resolved": "https://registry.npmjs.org/etag/-/etag-1.8.1.tgz",
+      "integrity": "sha512-aIL5Fx7mawVa300al2BnEE4iNvo1qETxLrPI/o05L7z6go7fCw1J6EQmbK4FmJ2AS7kgVF/KEZWufBfdClMcPg=="
+    },
     "express": {
-      "version": "4.16.3",
-      "resolved": "https://registry.npmjs.org/express/-/express-4.16.3.tgz",
-      "integrity": "sha1-avilAjUNsyRuzEvs9rWjTSL37VM=",
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