Added some descriptions for the AnimationManager class.
Added some descriptions for the AnimationManager class.

englercj/phaser,TukekeSoft/phaser,spayton/phaser,photonstorm/phaser,BeanSeed/phaser,TukekeSoft/phaser,spayton/phaser,BeanSeed/phaser,mahill/phaser,photonstorm/phaser,mahill/phaser,TukekeSoft/phaser