Refactored collision_matrix -> collisionMatrix + collisionMatrixPrevious. Now two triangular arrays instead of one matrix of two diagonal halfs.
Refactored collision_matrix -> collisionMatrix + collisionMatrixPrevious. Now two triangular arrays instead of one matrix of two diagonal halfs.

Tezirg/cannon.js,jzitelli/cannon.js,beni55/cannon.js,mcanthony/cannon.js,jzitelli/cannon.js,Tezirg/cannon.js,beni55/cannon.js,schteppe/cannon.js,schteppe/cannon.js,mcanthony/cannon.js