mattdrayer/api-profiler-middleware: Hotshot/CProfile support

@chrisndodge -- here's the initial submission for the profiler work I've been doing -- seems like it works pretty well, but probably some tweaking required here and there.  I'll catch up w/ @dmitchell and others as well.
Not sure I get this, what does it mean to raise this exception. There are going to be a lot of users hitting this middleware some who are superusers and others who are not