I've added a docs page displaying all of the different colormaps available to the user, as well as the distinction between MPL and yt-native colormaps.
In addition, I'm working with @xarthisius to make the docs autorun a python script which generates a series of identical projections of the same dataset where only the colormap changes in an effort to better illustrate how each colormap looks (Thanks to @jwise77 's great suggestion shown here: https://plus.google.com/photos/113772070647774739169/albums/5701300459759251713 ). This PR should not be accepted until @xarthisius give it the OK, since he may have to do some modifications on the server side to make sure the auto-generated images work.
N.B. I am including static images of the list of cmaps, because I want this to work at some basic level on yt.readthedocs.org, and two images are small file sizes. Lastly, the colormaps aren't expected to change in number too often, so I figured this was a valid step.
UPDATE1: Took into account the comments. Didn't end up switching the projection as @ngoldbaum suggested, simply because it drops the zero points of the cmap, but the zoom/target can be changed later. Created an extension to automatically run in the colormaps and generate the rst dynamically from the images found as suggested by @xarthisius . Tested and seems to work here. I think this is done.
Looks awesome to me, and I'm in agreement about including the images. Nice!
Everything is set on jenkins in preparation for this PR. Currently images are copied to source/cookbook/_static, would you like those files to be put somewhere else?
Let's put them in source/visualization/colormaps/_static , just so they don't get in the way of the cookbook stuff
One more thing: maybe it'd be worthwhile to add some script that would generate an .rst file using those images.