Hixie76 support example

[hadleyrich]

This seems to work (with gevent-websocket server at least) updating support from Hixie75 to Hixie76.

Note that auth values are hard-coded, using the values from the draft.

Hybi support is a much more complicated change.

[1]http://tools.ietf.org/html/draft-hixie-thewebsocketprotocol-76

[krohling]

Thanks Hadley, I'll review shortly!