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().
Merge branch 'feature-avfplayer' of https://github.com/prisonerjohn/openFrameworks into feature-avfplayer
changes to make compatible with new const OF
Merge pull request #2 from openframeworks/feature-avfplayer

AVFoundationPlayer const fixes
Tabs to spaces in ofAVFoundationPlayer files.
Fixed const correctness in AVFoundationPlayer.
AVFoundationPlayer: Removed half-implemented audio analysis stuff. Will add back in once it works properly.
Switched to @autoreleasepool, see #3508 for details.