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