Include wavelength limits of propagation effects in models too.
Merge pull request #22 from rcthomas/model_wavelength_limits

Include wavelength limits of propagation effects in models too.
Fix fit_lc() failure on numpy 1.8 and related docstrings

In normalize_data() which is used in fit_lc and plot_lc, there was
a call where a MagSystem object was being passed to Model.bandflux().
This is not supported in numpy 1.8 because object arrays are not
broadcastable in that numpy version.
add test for minwave/maxwave
add test for fit_lc()
prevent build from cythoning pyx files unnecessarily
add contributors for 0.4.1 release
document 0.4.1 changes
fix calspec URLs; fix download_file() timeout
document v0.4.2 changes

Conflicts:
	CHANGES.rst
minor formatting in whatsnew docs titles
Before mergeing changes to models.py for errors
Changes before pulling changes
changes included
compiles
Added colordisp, runs without major errors
Added floor, flux ratio on errorsnake, no protection for negative fluxes yet
Adding, but not done, chisq
PEP8 fixes; remove unused v00,v11, v01 SALT2Source args
working SALT2Source.bandflux_rcov()