Remove spacing='uniform' argument to contourf

[xylar]

There seems to be no such argument

[xylar]

Before the is fix, I was getting warnings like the following when plotting climatology maps:

/home/xylar/miniconda2/envs/mpas_analysis/lib/python2.7/site-packages/matplotlib/contour.py:967: UserWarning: The following kwargs were not used by contour: 'spacing'

After this fix, the warnings go away. I believe this is a valid argument for colorbar but not for contourf and its inclusion in contourf may have been an error. Another possibility is that this was a previously supported argument that is no longer used, but I was not able to find evidence of this. In any case, the results are unchanged by removing this argument because it was already being ignored.

[xylar]

@milenaveneziani, could you run a quick test and verify that I didn't break anything and that you don't see any warnings of the type listed above when you run? Thanks!

[milenaveneziani]

nothing broken. and no warnings.

[xylar]

Great, thanks!