SPWebsocketChannel: Updates initializer
SPWebSocketInterface: Updates initializer
SPWebsocketChannel: Updates Style
SPWebsocketChannel: Nukes redundant request
SPWebSocketChannel: Prevents potential race
SPWebSocketChannel: Prevents nil CV
SPWebSocketChannel: Adds Failsafe
Merge remote-tracking branch 'origin/develop' into issues/325-preventing-empty-cv

Conflicts:
	Simperium/SPWebSocketChannel.m
	Simperium/SPWebSocketInterface.m
Prevents reentrant allVersionsFinished calls
Reverting failsafe
Merge pull request #326 from Simperium/issues/325-preventing-empty-cv

SPBucket: Prevents empty lastChangeSignature scenarios