Added in documentation for AudioManager, Controller, GamepadController, GamepadManager, KeyboardController, Timer and Vector2
Added in various [key]Released variables into Controller and subclasses.
Changed how GamepadController handles input on creation so that it doesn't cause auto-selection when activated with the select button.
GamepadController and KeyboardController now have methods for determining the kind of controller used and sets the keys accordingly.
Removed GamepadManager.update
Added in xbox.json which holds control info for an Xbox 360 controller.
Added in Vector2.perpRight to return the perpRight vector.  (Was added in the last update but not noted.)