added setuptools to setup.py, but ONLY if develop is used
BUGFIX: cubes correctly processes BUNIT
added a new NH3 cube example
added NH3 cube example
added nh3 cube example html
added cube to examples page
reduced size of links to github/bitbucket
rebuilt docs
explicitly set backend in the hopes that it helps the travis build
cubes bugfixes: astropy introduced some incompatibilities.  Apparently astropy
will recognized "ACDELT3" as "CDELT3", so you can no longer rename header
keywords to get rid of them.  This really sucks, and broke my aplpy interface.
It's fixed now, but maybe at the cost of WCS working
flatten header removes PC keywords
bugfix in fitnh3: wasn't storing parinfo, just modelpars, which is wrong
fixed wrapper docs (and rebuilt all docs)
Apparaently you can't do
=====
title
=====
but
title
=====
is ok?