Two developments to SVGDrawable: (1) It now uses a bitmap to cache the
rendered SVG image. Aside from the obvious performance benefit, doing
this also cured a problem where the SVGDrawable looked aliased when used
to provide icons in ActionBarSherlock. (2) An alternative constructor
allows the Drawable's intrinsic dimensions to be specified, overriding
those that would normally be taken from the SVG document. This is useful
for example when using with ActionBarSherlock which calls setBounds()
based on the intrinsic width and height; it means you can specify the
icon size rather than it being too large due to the original SVG image
size.