Move ObjectAL into submodule

List of changes:
* ObjectAL, ogg and tremor removed
* ObjectAL added as submodule
* ObjectAL submodule based on fork of https://github.com/kstenerud/ObjectAL-for-iPhone
* ObjectAL submodule has Android/Apportable changes merged in
* ObjectAL submodule has ogg+tremor as nested submodules
* Cocos2d Xcode project updated to use ObjectAL as an "Xcode sub-project"