Cache in development
Cleanup header navigation
Remove defunct `DeliveryHelper`
Move `<h1>` outside of `<div id="content">`
Use unminified versions of jQuery and jQuery UI

Makes it easier to debug any problems in jQuery when in development.
Add backbone.js and update underscore.js
Remove ember
Add jquery.pjax
Add backbone-support and js-routes
Disable root elements for JSON array responses
Switch to cookies.js

Defaults `path` to `'/'` where cookie.js does not. Makes the default
settings on the client match those on the server.
Switch delivery search to be server-rendered
Port new delivery page to server-rendered/Backbone

* Always include all attributes in `UserSerializer`
* Add `Besko.Collections.Recipients` for querying recipients in
  autocomplete
* Port ember autocomplete input to backbone. Is configured by specifying
  the Backbone collection to use for querying and triggers a `select`
  event when picking a result. Requires the markup to be pre-rendered.
* Redirect to the page for the delivery after creation.
* Cleanup/update `ReceiptsHelper`
* Small modifications to tests to update them for the new markup
Remove now-unused `DeliverySerializer`
Cleanup `before_create` callback on `Delivery`

Use `Time.zone.now.to_date` over `Date.today` so timezone is taken into
account.
Don't apply button styles to all buttons by default
Remove now-unused `yield :bootstrap`