Add a dashboard

Currently the dashboard allows users to get a quick overview of the
status of jobs they're interested in, but more will be added,
e.g. viewing all your jobsets or all jobs of which you're a
maintainer.

src/root/topbar.tt

@@ -9,6 +9,10 @@
 
 <ul class="nav pull-left">
 
+  [% IF c.user_exists %]
+    [% INCLUDE menuItem uri = c.uri_for(c.controller('User').action_for('dashboard'), [c.user.username]) title = "Dashboard" %]
+  [% END %]
+
   [% WRAPPER makeSubMenu title="Status" %]
     [% INCLUDE menuItem
        uri = c.uri_for(c.controller('Root').action_for('queue'))