Lacosmicx

I have finished the optimized LA Cosmic implementation. It uses Cython for the main part of the algorithm and uses C for the individual routines. Everything is multithreaded using OpenMP (the Cython standard). For a 4K x 2K image, this implementation is ~35 times faster than cosmics.py written by Malte Tewes (which is already significantly faster than the original IRAF version). 

Given the complexity of this code, should this be included in imageutils or should it be its own package? 

Any other comments are welcome.
I'm happy to update this convention, though I haven't had a chance to do so yet. However, on my local machine, build_sphinx produced no warnings. When I look at the index file I don't find any mention of lacosmicx. Is there something else I need to set up or is this different because of Cython? Thanks for your help.