Thanj/add icons

Adds all the custom brand icons used so far, plus some product icons used in marketing that could be useful.

Uses svgmin+grunticon to process source svg files for each into inline data urls for each color required plus png images as fallbacks.
 
I think this is a flexible enough structure to build on with new icons as necessary, and its the best display and performance available for most desktop browsers (data-urls are really slow on mobile browsers, but I'm thinking the primary audience of this site will be desktop users.)

Overview of structure: http://quilt-next.janrain.com/branding/#icons
Icons for "roles": http://quilt-next.janrain.com/branding/#icons-roles

Thoughts?