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* Python 3 support fixes (140, 155, 159)
* Generic token-parsing plugins support (162)
* Generic authentication plugins support (172)
* Fixed frame corruption on big-endian systems (161)
* Support heartbeats (via PING) and automatic responses to PONG (169)
* Automatically reject unmasked client frames by default (strict mode) (174)
* Automatically restart interrupted select calls (175)
* Make 'run' respect environment settings (including virtualenv) (176)