Socketio-client3

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- Merged pull requests from original client: 158, 154, 126
- Fixed unicode decode from 158

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- Fixed thread cleanup
- Fixed disconnect detection if defined directly thanks to Andreas Strikos
- Fixed support for unicode payloads

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- Upgraded to socket.io protocol 1.x thanks to Sean Arietta and Joe Palmer
- Fixed support for Python 3
- Fixed SSL support
- Added locks to fix concurrency issues with polling transport
- Added SocketIO.off() and SocketIO.once()

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- Added support for Python 3
- Added support for jsonp-polling thanks to Bernard Pratz
- Added support for xhr-polling thanks to Francis Bull
- Added support for query params and cookies
- Fixed sending acknowledgments in custom namespaces thanks to Travis Odom
- Rewrote library to use coroutines instead of threads to save memory

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- Added support for custom headers and proxies thanks to Rui and Sajal
- Added support for server-side callbacks thanks to Zac Lee
- Merged Channel functionality into BaseNamespace thanks to Alexandre Bourget

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- Added support for secure connections
- Added SocketIO.wait()
- Improved exception handling in _RhythmicThread and _ListenerThread