SPPersistentMutableSet: Performing write operations in a private queue
SPPersistentMutableSet: Moves autorelease pool
SPLogger: Performing print operations asynchronously
SPChangeProcessor: Decouples 'processLocalObjectWithKey'

- Added new ‘markObjectWithPendingChanges’ method
- Enhanced performance: objects marked for later processing won’t
trigger CoreData fetch’es
SPChangeProcessor: Nukes dupe code
Merge remote-tracking branch 'upstream/develop' into embedded-objects

Conflicts:
	Simperium/SPChangeProcessor.m