Reasonable pht pass at auth.
Summary: Spent some time going through auth stuff for pht's.
Test Plan: Tested logging in, logging out, reseting password, using Github, creating a new account. I couldn't quite test everything so will double read the diff when I submit it.
Reviewers: epriestley, btrahan
Reviewed By: epriestley
CC: aran, Korvin
Differential Revision: https://secure.phabricator.com/D4671