Store principal profile pictures in new directory
Add ability to get permanent signed download url
(Issue 879) Fix intermittent test failure in revision filter test
Touched up some comments
Implement "Become User" functionality
Change oae-rest branch to become-user
Add indication in log when a user is impostered
(BecomeUser) Review followup
(BecomeUser) Filter HTTP headers when logging
(TravisCI) Print log errors on failure