Add a Differential revision status tokenizer datasource
Summary:
Ref T2543. This adds a tokenizer, similar to the Maniphest tokenizer, so the hard-coded <select /> control in Differential ApplicationSearch can be replaced with a more flexible control that handles the addition of new statuses with more grace.
This only adds the new datasource.
Test Plan: Used /typeahead/class/ to preview the behavior of the new datasource.
Reviewers: chad
Reviewed By: chad
Maniphest Tasks: T2543
Differential Revision: https://secure.phabricator.com/D18392