New icons for Projects

Summary: Updates the builtin images, leaves the old choose... icons for now. I'd like to automate this based on icon when creating a project.

Test Plan: Visit edit picture page, pick a few. Purge cache, see new default image.

Reviewers: epriestley

Reviewed By: epriestley

Subscribers: Korvin

Differential Revision: https://secure.phabricator.com/D18162