- Wait for the block to complete.
- Only dispatch completion handler when it's not nil.
… a block in the background. It may be necessary in some cases to always have a fresh new context with no cached objects, while in other cases, it's better the simply reuse the context which is in the current thread.
…on of the newer method, MR_contextThatPushesChangesToDefaultContext
Fix a typo method name Fix compile warnings for Mac and iOS
…ate header definition