Fix #61 - Replace performSelectorOnMainThread: with dispatch_async.
Fix #61

Moved _YMS_PERFORM_ON_MAIN_THREAD to YMSCBUtils.h
Fix #61

Move _YMS_PERFORM_ON_MAIN_THREAD to YMSCBUtils.h
Fix #61 - Replace performSelectorOnMainThread: with dispatch_async()
Fix #61 - Replace performSelectorOnMainThread: with GCD call dispatch_async.
Updated project.
Updated documentation for v0.942
Updated documentation for v0.942
Updated for v0.942
Docstring fix.
Updated tutorial to support v0.942
Updated to describe GCD updates on main thread.
Updated to describe GCD updates on main thread.