2.1.4
[NEW] Added the `Pusher.prototype.allChannels` method
[NEW] Implemented the `enabledTransports` option
[NEW] Implemented the `disabledTransports` option
[CHANGED] Connections are not closed anymore after receiving an offline event
[CHANGED] Connections are still attempted, even if the browser indicates it's offline
[CHANGED] When not connected, an online event will trigger a new connection attempt immediately
[CHANGED] Updated the stats protocol