Update browser support page

[paladox]

Hi please could you update browser support page to show if it works with newer browsers and other devices please.

[doublejosh]

Recently noted that localStorage doesn't work in Safari in private mode (with v8 in Yosemite). Certainly not jStorage's responsibility, but could be noted.

https://slashdot.io/blog/local-storage-is-not-supported-with-safari-in-private-mode