fixed css relative path to minicolors sprite
reverting bug I introduced, woops
Merge pull request #115 from infocortex/fix_minicolors

fixed css relative path to minicolors sprite
added fa reference to surface_gradient()
refactored hatch overlay code in quickflat, added option for extra_hatch
updated quickflat docstring
BF: fixed roi line opacity
fixed some bugs, but more to go..?
Fixed non-existent normalization for raw (RGB) volumes, small steps toward getting dotted lines in webgl view
Merge branch 'master' of https://github.com/gallantlab/pycortex w/ addition of normalization in raw volumes