Register the browse routes with the router
Register the browse routes with the router

This adds a new Rake task to register the '/browse' and '/browse.json'
routes to the collections app. 

At the present time, we do not want this to run automatically, so this 
remains a standalone Rake task that must be run manually in the preview
environment.
alphagov/collections,alphagov/collections,alphagov/collections,alphagov/collections