Shapes were not inserted into the spatial hash when not moved. Shapes
set to passive directly after creation would not be in the hash,
resulting in no collision reports.
Spatialhash drawing updated to the new cell indexing method.
Polygon triangulation bug:
In some cases Kongs triangulation algorithm produces triangles
with collinear points. The Polygon constructor removes one of
these and throws an error because there are not enough vertices.
Checking if the current points in a triangulation step are
collinear and discarding those triangles fixes the problem.
Class-commons lets you use any supporting class system as
backend for HC.
Add SpatialHash:draw() for debug purposes.
