Websocket-client

- Add response headers in WebSocketBadStatusException (501)
- Manually assigning WebSocket-Version (506)
- SSL socket handling fix (474)
- Let setup.py use the same license as LICENSE file (517)
- Ensure that "timeout" is passed down, when calling WebSocket.connect() (513)
- Retry connect on "Interrupted system call" (528)

- Change license from LGPL to BSD.
- Status return for WebSocketApp.run_forever() (492)
- Handle redirects in handshake (491)
- Make proxy_type option available in WebSocketApp.run_forever() (486)
- Fix typo in supress_origin (485)
- WebSocketApp's on_close never emits status code or reason (479)

- on_open() missing 1 required positional argument: 'ws' (471)

- fixed callback argument in _app.py (468)
- Fixing none compare bug in run_forever (472)
- Fix NoneType bug introduced by 386 fix (476)

- revert "WebSocketApp class to make it inheritable (442)" because of breaking the compatibility

- fixed pong before ping (461)
- pass proper arguments to method callbacks (462)