fix possible leak in autocancel loader
fix critical bug with cancel callback in merger
add barrierBalancedLoaderWithLoader
add balancedAsyncOperationInContext method
add loaderWithAdditionalParalelLoaders method
code style fixes
fix clang warnings
add and use JFFLogger
add and use JFFLogger
add and use JFFLogger
code style fixes
simple refactor
add forceRemoveFromParentViewController method
fix clang warnings
add and use JFFLogger
code style fixes
add coredata read write locks
refactor CoreData and fix bugs for IOS 6.0