Register browse routes on deploy

Run the router:register_browse task as part of the router:register task
which gets called automatically on deploy.
Register redirects for browse pages at root on deploy

These will eventually be added to router-data and removed from here, 
but to make the deployment simpler, we're going to enforce these as 
part of Collection's route registration for now.
Merge pull request #29 from alphagov/register-browse-route-on-deploy

Register browse routes on deploy