Merge pull request #90 from amdprophet/ui_2.0

Namespaced Backbone JS w/CoffeeScript Rewrite
Set a default empty hash for [:head] to prevent error setting [:head]["Accept"] later.
Merge pull request #91 from nstielau/api_options_head

Set a default empty hash for $api_options[:head]
Adding therubyracer dependency.
Merge pull request #92 from nstielau/gemspec_therubyracer

Adding therubyracer dependency.