fix WebSocket cannot send/receive more than 4096 bytes of data
Merge commit 'refs/pull/5003/head' of git://github.com/cocos2d/cocos2d-x into websocket-test
closed #3605: Websocket doesn't support send/receive data which larger than 4096 bytes, renames member variables to follow cocos2d-x coding guide line.
Merge pull request #5008 from dumganhar/iss3605-websocket-4k

Merge PR #5003: fix WebSocket cannot send/receive more than 4096 bytes of data