R1:c6bdd2c56bab

Add Ngram support to Dashboards / Panels

Summary: Build ngram indexs, adds search by name capability.

Test Plan: Search for a dashboard by partial name, search for a panel by partial name.

Reviewers: epriestley

Reviewed By: epriestley

Subscribers: Korvin

Differential Revision: https://secure.phabricator.com/D17090