WIP: Ordering scan of articles.

- Added functionality for ordering scans of articles
  - Classes of special interest are orders_controller.rb and order.rb
- Added functionality for paying for article scans through DIBS
  - Module pay_it.rb contains this stuff.
- There are still a lot to be done some of which is:
  - Danish version of payment process.
  - Integration with GetIt for getting prices and hiding/showing
    the correct HTML for ordering when this should be available.
  - Error handling
  - Capture amount from DIBS when document is delivered.
  - Reworking the receipt page
  - Updating various texts
  - I18n for various texts (some are still hardcoded in html.erb)
  - Recording order events as they are reported from DocDel.
  - Reworking the order status page.
  - Adding a page for a user to see all his orders
Updated cukes and specs.

- Removed obsolete specs from cover_images.
- Updated cukes to reflect that the locale is now part of the URL.