Python27 support

[chorejasbob]

Python 2.7 tests passing:

`(venv)$ python --version
Python 2.7.16
(venv)$ nosetests -v tests/test_JMXQuery.py
tests.test_JMXQuery.test_wildcard_query ... ok
tests.test_JMXQuery.test_kafka_plugin ... ok
This test is to check that we don't get any threading issues as the module will be ... ok

---

Ran 3 tests in 9.018s

OK
`

Python 3.6 tests passing:

`(venv)$ source ../venv3/bin/activate
(venv3)$ python --version
Python 3.7.3
(venv3)$ nosetests -v tests/test_JMXQuery.py
tests.test_JMXQuery.test_wildcard_query ... ok
tests.test_JMXQuery.test_kafka_plugin ... ok
This test is to check that we don't get any threading issues as the module will be ... ok

---

Ran 3 tests in 8.689s

OK
`

[chorejasbob]

fixes issue #15

[chorejasbob]

Updated with the recommendations, except for two things.

1. The builtin subprocess module in python 2.7 doesn't include a timeout option or the run() method call, which this uses.

2. enum appears to be included in the python 2.7 standard library.

I found that nosetests swallows any print statements by default, except if you use the '-s' or '--nocapture' option. The following gist shows the results of the tests.

https://gist.github.com/chorejasbob/890137b096ffae50dc86158d60c0c062