Show status icon on build view

Summary: This shows the status icon and color along side the build status on the build view controller.

Test Plan: Viewed a build, saw the icon appear.

Reviewers: epriestley, Blessed Reviewers

Reviewed By: epriestley, Blessed Reviewers

Subscribers: epriestley, Korvin

Differential Revision: https://secure.phabricator.com/D10094