refreshing everything but jQuery and text.js

This commit refreshes most of the constituents of this directory.
Versions of updated libraries are:

Backbone.js: 1.1.0
Ember.js: 1.1.2
Font Awesome: 4.0.3
Handlebars.js: 1.1.2
LESS: 1.5.0
Mustache.js: 0.7.3
Require.js: 2.1.9
Twitter Bootstrap: 3.0.2
Underscore.js: 1.5.2