astropy/specutils — pull request #36 by wkerzendorf (2013-10-28 20:31:14+00:00)
Title: specwcs update to new modeling API

This is updating specwcs to the new modeling API. As discussed with @embray there are still problems with `Quantity` that need to be addressed, but otherwise I think `Model` is getting there.

I will use this PR as a base for a restructure in Spectrum1d (using `.wavelength', `.frequency`, `.energy` as discussed with @keflavich).

there are some questions in my specwcs.py comments - please comment if you have an answer.