EPhysics: body collision data

EPhysics: body collision data

This patch introduces a wrapper(EPhysics_Body_Collision) to hold
the collision data(the contact body and collision position).

This data type is used by EPHYSICS_CALLBACK_BODY_COLLISION callback. The
collision detection test is migrated to the new API as well.

Patch by: Leandro Dorileo <dorileo@profusion.mobi>

SVN revision: 74500