Modified finitestraincrystalplasticity #3949

Lots of hardcoded 3's here.  I realize you are working in 3D space, but it would be very easy to use a constant throughout representing the space size (like LIBMESH_DIM) so that in the very rare case when everything is coded for 2D or even 1D, this code would just work.  Not a show stopper, just giving you suggestions.