Add an Atom controller to Diviner

Summary: Ref T988. Lots of rough edges still, but this pulls the right data and dumps it into a reasonable-looking shell.

Test Plan: {F44883}

Reviewers: chad, btrahan

Reviewed By: btrahan

CC: aran

Maniphest Tasks: T988

Differential Revision: https://secure.phabricator.com/D6104