Also order unbilled tasks descending by date in the time_entries view
Fix missing root prefix calls for views

Because we override mab_done in StopTime::Mab, we override the functionality
in Camping::Mab that applies 'self /' on :href, :src and :action attributes
of tags.  Thus, all kinds of links don't get a root/mount prefix.
Include jQuery 1.10.0 directly from public/

This solves all kinds of issues when deploying via HTTPS and jQuery
being retrieved via HTTP.
Show "None" for absent time entry comments in the time_entries view

There needs to be some kind of placeholder the comment is the thing
to click on when clicking through to the time_entry view.