Using Rails asset pipeline; moved assets to app/assets; updating lots of paths

The paths of images, JS, and CSS will all change to /assets (e.g. /assets/application.js). In production, since nginx is serving the assets, it is necessary to precompile all assets into a single folder. This can be done with by running `rake assets:precompile RAILS_ENV=production` after updating the code

Also, nginx.conf will have to be updated to reference this new location for static content
Should the nginx expires directive be set to match this, something like 60d?