Various bugfixes in Graphics#_getBounds
Various bugfixes in Graphics#_getBounds

- fixed property name for stroke box (from strokeBox to strokeBbox)
- removed now invalid warning about not caching results
- made the function always return a bounds object instead of the insane 0 for empty paths
- simplified control flow

mozilla/shumway,yurydelendik/shumway,mbebenita/shumway,yurydelendik/shumway,mozilla/shumway,mozilla/shumway,yurydelendik/shumway,yurydelendik/shumway,tschneidereit/shumway,tschneidereit/shumway,mbebenita/shumway,yurydelendik/shumway,mozilla/shumway,mbebenita/shumway,mozilla/shumway,mbebenita/shumway,tschneidereit/shumway,tschneidereit/shumway,tschneidereit/shumway,mozilla/shumway,tschneidereit/shumway,yurydelendik/shumway,mbebenita/shumway,yurydelendik/shumway,mbebenita/shumway,mozilla/shumway,mbebenita/shumway,mozilla/shumway,tschneidereit/shumway,yurydelendik/shumway,mbebenita/shumway,tschneidereit/shumway