added treehouse as sponsor
added sponsor to main page
upgrade bootstrap to 3.1.0
build with less instead of recess
add missing menu items to united page
3.0.3 -> 3.1.0
MIT license
banners in css files, closes #205
fix image and url for treehouse
new themes cupid, lumen, and superhero
larger preview thumbnails
new favicon
flatly: remove table borders
readable: tweaks to navbar and type
simplex: tweaks to type and buttons
tabs to spaces
remove tabindex
remove table-bordered class from preview table
add panel-default class to panel on test page
api: remove punctuation in theme descriptions