Remove already-disabled clicky analytics
[gem] Add asset gems

They're not in an assets group, because we'll be moving to Rails 4 in
the near future.
Enable the asset pipeline in config files
Add .sass-cache/ to .gitignore
Remove jquery and rails.js

They'll be included by the jquery-rails gem
Move third-party assets into vendor/assets
Move custom assets into app/assets
Split Javascript into more granular files, add manifest
Include vendored JS in the asset manifest

Previously, these scripts had been included by individual views
and loaded on-demand.
Precompile IE-support javascript
Add CSS manifest
Process app CSS as SCSS, use image-url asset helper
Fix farbtastic image loading
Merge pull request #61 from osbridge/asset_pipeline

Use the Rails asset pipeline to process JS/CSS assets