v3.3.0

0e75b4e Fix bug #8: Client Need to ignore the Reason-Phrase
3ea7687 b64_encode: Refactoring
94a059d b64_decode: Drop unused code
db5f7d9 buffer: Import as submodule
558581e LICENSE: Change the license from LGPL2 to MIT
236e70f Lua-binding
1b91718 export new api: free
81d1bb6 Fix bug: Referenced a null pointer
0a838be Check url whether is NULL in parse_url
9d4d6b6 uwsc_init: Used to init a uwsc structure