Refactored semaphores to use dispatch_sync
Removed dispatch_retain
Refactored properties with retain to strong to eliminate any instances of retain moving forward
Merge pull request #55 from keenlabs/51_refactor_semaphores_to_use_dispatch_sync

Refactored semaphores to use dispatch_sync
Merge pull request #56 from keenlabs/53_remove_dispatch_retain

Miscellaneous ARC cleanup
Added KeenClient-Cocoa target to support Mac OS X