Summary: I want to add a command like "where is ArcanistUnitTestEngine" to
phabot. I also want to add a symbol typeahead to Diffusion and generally finish
up that feature since it's useful but only half-implemented. Consolidate the
query logic and expose the data over Conduit.
Test Plan: Used /symbol/ and Conduit to lookup symbols.
Reviewers: btrahan, jungejason
Reviewed By: jungejason
CC: aran, jungejason
Maniphest Tasks: T315
Differential Revision: https://secure.phabricator.com/D1260
