Add Underscore, Backbone+Marionette dependencies.
Reimplement JS for Admin::Blogs#show as Backbone view.
Add Appleseed.Views.BaseView class.

Implement JavaScript specs using Jasmine.

Current spec status:
  Jasmine: 17 specs, 0 failures in 0.027s.
  RSpec: 270 examples, 0 failures in 4.03 seconds.
Implement Blogs::Show layout.

Current spec status:
  Jasmine: 30 specs, 0 failures in 0.029s.
  RSpec: 270 examples, 0 failures in 3.5 seconds.
Convert remaining JS features to Layouts.

Current spec status:
- Jasmine: 31 specs, 0 failures in 0.032s.
- RSpec: 270 examples, 0 failures in 3.54 seconds.
Merge pull request #16 from sleepingkingstudios/library-backbone

Convert JS features to Marionette layouts.