Nukes deletion queue
DeletionCascadeTest: Minor improvements
Issue #181: Implementing syncrhonization helpers in both SPStorage providers
SPJSONStorage: Updating CriticalSection API
SPStorageProvider: Updating CriticalSection API
SPCoreDataStorage: Fixes NSObjectInacessible exception in context merge
Issue #181: Deletions are now thread safe
Merge remote-tracking branch 'origin/develop' into index-reconciliation

Conflicts:
	Simperium/SPCoreDataStorage.m
	Simperium/SPIndexProcessor.m