Add per channel operation lock.

Make onAuthorize won't block thread.

Release 2.2.5

Merge pull request pusher#281 from pusher/dev-release-2-2-4

Release 2.2.4

release 2.2.3

Merge pull request pusher#269 from pusher/investigate-decryption-fail…

…ures

2.2.2 - Fix decryption failures

Merge pull request pusher#257 from pusher/dev-force-to-use-2

Refactor PusherOptions forceTLS to useTLS

Merge pull request pusher#255 from pusher/dev-encrypted-use-tls

2.2.0 Pusher Options encrypted to forceTLS

Merge pull request pusher#252 from pusher/multiple-connections-on-retry

Do not use the disconnect method to tear down on pong timeout

Merge pull request pusher#251 from pusher/decrypt-integration

Release 2.1.0