Release 0 | Beta 2 | Development 2 | Experimental 0

* Added GUIBorder
* Added GUIPosition
* Added GUIImage
* Added support for components within components
* Added GUIComponent positioning system using
  GUIPosition
* Added onMouseDragged() in the Input system

* Fixed bug: GUIComponents - Mouse could click
             components when dragging the mouse
             over them
* Fixed bug: Inactive GUIComponents didn't render
             properly unless the inactive colour/
             image had been set
* Fixed spelling: Center should have been Centre in
                  GUIComponent