fix MGCommandGroup & MGCommandExecutor memory leaks
wrap an autoreleasepool around the specs to make it work with XCode 4.6
enable all specs again
format code to match existing code style
Merge pull request #22 from patrickkulling/memory_fix

Memory fix
Fix compile error in test
Make example block animation work again
Fix formatting issues
Fix retain cycle warning in xcode
Increase version to 0.2.0
Exception when cancel is called