Blender Git Loki

Rigify:
Added a tail control rig.
For now, you have to manually hook the resulting controls up to a separate spline IK rig that you make by hand. Perhaps this can be automated in the future.
For anyone using this: keep in mind that you need separate armatures for the tail deformation bones and tail control bones. Otherwise you create a cyclic dependency like so:
tail deform bones <- spline object <- tail control bones