astropy/astropy — pull request #1681 by nden (2013-10-25 17:25:37+00:00)
Title: Make sure polynomials can be fit with non-liner fitters

Allows fitting of all polynomial models with non-linear fitters. This was already possible for `Polynomial1DModel` and `Polynomial2DModel`, not sure if the rest of the polynomials were just missed or overwritten.