In general, we always use relative URLs (using `_path`), but sometimes
we were accidentally using absolute URLs (using `_url`). It's been
reported i might cause some isuses if accepting both HTTP and HTTPS
connections, although we've never seen the case.
In any case, this change makes the code more consistent and makes the
generated HTML cleaner.
Dashboard routes have been refactored. Now instead of having resources
for dashboard and routes inside a dashboard namespace the proposal
routes contain a dashboar singleton containing everything related to it.
