[fix bug 1055563] Initial db table for the action items.

* Migrate reps and mozillians dashboard in a new app.
We need to prioritize and assign tasks based on a functional group. For example the action items for the Council group are different from the action items of the Rep group.

Regarding the external urls, I totally agree, especially regarding bugzilla. I don't know if saving a link pointing to an internal url in the case of a voting is the best approach. Probably a foreign key is a better fit. The reason I didn't include either, is because it's not very clear at the moment how are we going to handle these tasks. I guess we can add these fields later when we populate these db tables.