Add a 'create' policy to Project

Summary: UX on this could probably be better 'disabled' crumbs don't appear to have any visible difference, and the policy error has to load the /create page rather than being a modal - not sure on the way to fix these.

Test Plan: Tried to create a project with and without access, saw suitable error.

Reviewers: epriestley, #blessed_reviewers

CC: Korvin, epriestley, aran

Differential Revision: https://secure.phabricator.com/D7279
Improve pagination in ChatLog application

Summary:
- Add an extra paginator at the top.
- Add a link to jump to the bottom (where the latest messages are).
- Align paginators with edge of content rather than the page.

Test Plan: Looked at the chatlog.

Reviewers: epriestley, chad, #blessed_reviewers

CC: chad, Korvin, epriestley, aran

Differential Revision: https://secure.phabricator.com/D7280