Serve up Angular templates as static pages

Using a Rails 4 convention, serve up static pages. Remove everything
from application.html.erb so the JS and CSS aren't redownloaded each
time we pull a template.

See also:
http://stackoverflow.com/questions/1146624/how-to-do-static-content-in-rails
Remove JQuery, we're using something better!
Pull in Angular UI router

- add to Sprockets
- define route for our service
- make global swift variable so as to not redefine app each time