Add `LoadingRoute` for #13, Footer As Partial
Add Partials for Welcome and Navbar
Fix Computed Prices When Price is Unknown
Controller Actions to Actions Object

As written in http://emberjs.com/blog/2013/08/29/ember-1-0-rc8.html

BTW, did you notice how the Ember guys keep calling this an 'action
hash', not 'action object'? Sounds like they're talking with a Ruby
accent.