Warning fixes + CocoaPods clean up

1) Currently if you clone your git repo in to a fresh repo, run pod install, open it and try to run it, you'll get errors relating to missing Pod files (you won't get this without a fresh clone because the Pod files are still there in your local directories so everything appears to work). Since the new version no longer depends on any Pods, no libPod.a is generated, and hence the project/workspace no longer works. At the time of writing cocoapods does not clean this up for you (http://stackoverflow.com/questions/21846522/cocoapods-not-creating-pods-xcconfig-on-pod-install, https://github.com/CocoaPods/CocoaPods/issues/1286). I've manually cleaned up the project so it builds again after a fresh clone.

2) Fixed a small warning in WitRecorder when WIT_Debug was set to 0.