Ability to assign groups.
To assign group, user must have a right to send a message to that group.
In addition, 2 jobs were introduced, - AssignNotification and UnassignNotification to inform interested users in the background about the new assignment.
This significantly reduces the amount of logic we need to carry in the discourse-assign plugin. One side effect is that I had to rename the 'q' parameter to 'search', so that it matches core's implementation.
Jarek Radosz
David Taylor
Ahmed Gagan