Clean up watchers and members project page
Summary: Various little fixes, mostly moves information from the "Details" section either into the curtain or into the specific watchers or members list based on user viewership. I think this page is both cleaner and more informative.
Test Plan:
Lock, Unlock, Watch, Join, various projects with multiple users.
Reviewers: epriestley
Reviewed By: epriestley
Subscribers: Korvin
Differential Revision: https://secure.phabricator.com/D17891