Fix issue of showing image incorrectly. - It is discussed in ticket #23 that objects are refreshed partially. - It is actually only for image since multiple image share a image paint, it will modify sampling matrix when they transforming. Values of later ones would over-write eariler ones. - It is fixed by move matrix setting until drawing.

content	MadBuilder	content/
overlay	chrome://browser/content/browser.xul	chrome://MadBuilder/content/MadBuilderOverlay.xul