Fix typo which caused WebSocket to fail on 

Fixes #23.

Looks like Android Kit Kat JS interpreter is more restrictive (and was not resolving `WebSocket` to `window.WebSocket` in `export WebSocket`).
Merge pull request #30 from juniorz/master

Fix typo.
exports websocket even when it's native.
Update README.md
Update README.md
Update README.md
added MayurChandra to list of contributors
added MayurChandra to list of contributors
Added WebSocket detection based on userAgent.
Adding window.WebSocket check #28