Engine/RemoteStore:
* Move code to make the engine remote directory into RemoteStore.
* Fix initSession call in Engine to properly use callback / call yield.
* Do not check '_getServerData' return status in _sync, we will use exceptions from RemoteStore instead.
* Move code to push a new delta into RemoteStore (appendDelta()). Currently comments out code that forces a re-upload in cases where the server (engine) format version was different. We may add this back later into RemoteStore (?).
* Note that this patch also removes the 'this._encryptionChanged' conditional, which I believe is currently useless (we never set it).
Service:
* When wiping the server (due to a server version mismatch), skip .htaccess files, since they are usually not user-modifiable.