Add a default 'stop' behaviour.
===============================

It might be more natural to allow the user to hit a button on
the current entry to stop the timer on it than to explicitly
create a new excluded entry.

Maybe have a default exclusion for all users, "ENTRY STOP" for example,
and have the button automatically add this entry.

----

=========  ==========
Created:   2011-06-17
Resolved:  YYYY-MM-DD
=========  ==========