No Option to Pass Parameters to Scalable CCD Narrow-Phase

[zfergus]

There is no way of passing max_iterations and tolerance to scalable_ccd::cuda::ipc_ccd_strategy inside compute_collision_free_stepsize. These should be specified as part of the NarrowPhaseCCD class, but there is no NarrowPhaseCCD for GPU CCD.

Originally posted by @zfergus in #123 (comment)