Massive update to Rails 4.1

Included in this update is a major refactor of the themes.
Reimplemented a couple removed gems.
Merge branch 'release/1.5'
Updated path to public theme.
Added a .ruby-version file
Moved pry to the Development and Test groups
Added Sidekiq and Capistrano related gems
Updated binstubs and moved Pry to be available in all environments.
Updated admin theme.
Removed pry-debugger.
Updated to Capistrano 3
Added Carrierwave test configuration
Load the large images instead of the full-sized image which can be pretty massive.
Update default post sorting.
Updated production deploy destination
Merge branch 'release/1.5.1'
Implemented a basic tag cloud.
Cleaned up the Posts controller
Updated ignore rules.
Initial List Subscriber implementation.