Fix for issue #1154
Created by: dsparacio
Added @deprecated tag to getVideoModel. Added API that some may use from videoModel to MediaPlayer. (Only some should be public) Added API docs to new API in MediaPlayer store video element in Video Model only and always reference from there. Removed unneeded checks in initializePlayback as it is internally called and not part of Play() anymore. Moved hack for preload firefox into video model.