fixed draw count display

It was wrong when there were only quads on the stage (no images).
added 'alignPivot' method to DisplayObject class (closes #293)
added optional 'id' paramter to 'TouchEvent.getTouch' method (closes #198)
now removing text field from Button if text is empty
now logging warning when adding the same asset name twice (closes #339)

Previously, an exception was thrown.
added support for RectangleTextures in AIR 3.8
now broadcasting keyboard events to all display objects
added support for updated ATF file format