working on guide for choosing colormaps. Have overview section and start on a few others.
added colormaps guide to beginner guide
some more text to colormaps
added a bunch of stuff to my colormap info
finished up draft
now with scripts actually included!
Merge pull request #3301 from kthyng/new_colormaps


DOC : added colormap information

Colormap choice guidelines in documentation - based on talk at SciPy 2014

Only changes to rst + examples scripts.