Implementations of IUE Reader. Superceeds #14
Merge branch 'master' of https://github.com/astropy/specutils into ioIUE
change IUE Reader for new API of Spec1D, add tests
fixing __all__ in spectrum1d
added first implementation of generalized spectrum wcs
tried to implement the interpolation using WCSs
finished first implementation of WCS in the specutils class
added a little bit of Documentation
Merge pull request #29 from wkerzendorf/wcs/merging_modelling

First go at spectral WCS
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
Merge pull request #16 from hamogu/ioIUE

Implementation of IUE Reader. Superceeds #14
fixed some tests in the IUE reader