Update feed on projects, profile.

Summary: Does a few things, standardizes feed a bit more on people, projects. Cleans up Project pages to be more dashboard like. Adds usable mobile support. Remove extenal public feed styles. The Project pages won't win any design awards, but they are much more usable and responsive (mobile). I assume the default view to be workboard still at some point.

Test Plan: Test out Profile, Project Profile, Public Feed, normal Feed. Mobile and Chrome.

Reviewers: epriestley, btrahan

Reviewed By: epriestley

CC: aran, Korvin

Differential Revision: https://secure.phabricator.com/D5700