WIP on CBLLiveQuery( (ReactiveCouchbaseLite).
WIP on CBLQuery (ReactiveCouchbaseLite).
Oops.
Work on CBLQueryEnumerator (ReactiveCouchbaseLite).
Fixes concurrency issues with CBLRevision (ReactiveCouchbaseLite).
Fixes concurrency issues with CBLRevision (ReactiveCouchbaseLite) and CBLSavedRevision (ReactiveCouchbaseLite).
Fixes some minor issues.