Added test for PolyhedronGeometry -- bug needs to be fixed: intersection not found on bottom face unless the vertices are specified in the wrong order, in which case a noisy face results.  This may be a clue into some of the noise seen on other geometries.
Added test for PolyhedronGeometry -- bug needs to be fixed: intersection not found on bottom face unless the vertices are specified in the wrong order, in which case a noisy face results.  This may be a clue into some of the noise seen on other geometries.

bwkimmel/jmist