R1:a37dc68b0adc

Show projects on feed stories

Summary: Fixes T1922. When a story is about a primary object associated with projects, show those projects on the feed story.

Test Plan: {F190171}

Reviewers: btrahan, chad

Reviewed By: chad

Subscribers: epriestley

Maniphest Tasks: T1922

Differential Revision: https://secure.phabricator.com/D10255