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

* Migrate reps and mozillians dashboard in a new app.
Also regarding groups the tasks that we are going to show can be per user without needing to add an extra dependency for groups. For example if a user is cc'ed in a bug and that requires an action to be taken its probably irrelevant whether he is in a group or not. Also for votings the action items are going to be created based on elligible group.

If you have a use case that requires the group foreign key lets keep it. Else I suggest to implement a per user action item and not per group.