tried to make some specutils features work that didn't, with an emphasis
on the fits reader

Conflicts:

	specutils/wcs/specwcs.py
fixed up units checking
fixed some whitespace, import issues
added simple test that merely implements a doctest
more cleanup work, attempts to get indexing working.  Something funny
about it though - why doesn't indexing on pixels work?
Merge pull request #32 from keflavich/updates

A little work on from_fits and from_array methods