Added AVFoundation video player classes to repo.
Added AVFoundation video player selection in ofConstants (set by default in OS X 10.8+).
Added AVFoundation video player include to ofVideoPlayer.
Wrapped QTKit video player in preprocessor #defines so that it is skipped when not in use.
Added AVFoundation files and linked frameworks to template Xcode project.
Cleaned up search paths in template Xcode project.
Updated video player example to ensure video is loaded before drawing it.
Fixed spacing in video defines.
Merge branch 'master' of github.com:openframeworks/openFrameworks into feature-avfplayer

Conflicts:
	examples/video/videoPlayerExample/src/ofApp.cpp
ofAVFoundationPlayer: Removed notice when calling update() on an unloaded player, it's not necessary.
Replaced literals by variables in the video player example.
Merge branch 'master' of github.com:openframeworks/openFrameworks into feature-avfplayer
ofAVFoundationPlayer: Implemented firstFrame(), nextFrame(), and previousFrame().
fix for event lag

* moves glfwPollEvents to top of App loop, and sleep logic to after display update, so that UI events can be processed immediately
ofImage saveImage: only swapRGB on required formats. Closes #3229

Also when swapping RGB reflect on the internal pixel type in ofPixels
Merge branch 'master' of github.com:openframeworks/openFrameworks
ofGstVideoPlayer: add getters for missing private varibles. Closes #3232
ofVideoPlayer: remove extra method declaration
ofPixels: avoid warnings
ofImage: use correct formats when loading