Summary: Basic hookup for Differential -> Feed. Also introduces "one-line"
stories for less-important stuff.
Test Plan: Interacted with some revisions, got feed stories out of it.
Reviewed By: jungejason
Reviewers: jungejason, aran, tuomaspelkonen, codeblock
CC: aran, jungejason
Differential Revision: 632
Summary: This defines an extremely basic version of an activity feed, like
Facebook's news feed. It doesn't do much of interest yet.
Test Plan: Published some feed stories:
https://secure.phabricator.com/file/view/PHID-FILE-5061aa72105bbdc05b21/
Reviewed By: tuomaspelkonen
Reviewers: jungejason, tuomaspelkonen, aran
Commenters: codeblock, jungejason
CC: aran, epriestley, codeblock, tuomaspelkonen, jungejason
Differential Revision: 593
