fix space over top navigation
serve images from /assets/img
Remove compass and image sprockets
move vendor assets into special folders
Bump backbone related javascript libraries

jquery.js: v1.7 -> v1.9.1
underscore.js: v1.3.3 -> v1.4.4
backbone.js: 0.9.2 -> 0.9.10

(downloaded from
http://marionettejs.com/downloads/backbone.marionette.tar.gz
- so everything fits together)
add sass-twitter-bootstrap with custom override

From jlong/sass-twitter-bootstrap
replace bootstrap sprites with font-awesome