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.
working towards having stash support
* initial loading indicator while data is being initially fetched
* better error handling
* fetch events, clients, and stashes in one swoop (GET /all)
* handlebars helpers for determining if a client or check is silenced
removed some debugging lines
Merge pull request #7 from amdprophet/ui_2.0

PR's from the ui_2.0 branch on sensu/sensu-dashboard