Merge pull request #85 from Peregrin05/master

Objects using Graphics are testable
Adding precision hit test to TriangleStrip

To avoid winding issues, I go for a more general barycentric calculation
of isPointInTriangle.

More math, but not crazy bad. It seems to work fine
Adding support for _precisionHitTestDistance in TriangleStrip

Making sure that _precisionHitTestDistance works better, both for
TriangleStrip and the getBounds method in general, when
_precisionHitTest is enabled