Summary:
Also you have to drop them. So drag, and then drop.
This needs some cleanup and reconciliation/generalization with the Maniphest implementation. In particular, you can't drag things to the very top right now, and they should share more CSS and more behaviors.
Test Plan:
Look I alphabetized them:
{F45286}
Reviewers: chad
Reviewed By: chad
CC: aran
Differential Revision: https://secure.phabricator.com/D6136
