docs(css): Install styledocco

Addresses #289 - this puts in the beginnings of styledocco, which can be run by typing in grunt styleguide right after grunt server is run. Subsequent pushes will feature non angular mark-up in the LESS comments so it will be seen in the styledocco documentation.

cc: @flazz 
This was taken from https://github.com/rackerlabs/encore-ui-template/blob/master/tasks/options/styleguide.js - include is an optional tag; I can assume undefined can be a blank array.