Reorder keys in human-ppc-decisions.json to be alphabetical
Add a manual decision about a new PPC non-match
Smoother Facebook login

This asks for an email address from facebook and doesn't ask for a
username.  This means that the facebook log in works with a single
click on the facebook auth page.
For manual (non-social) logins, require a verified email address

This is to make it slightly more difficult for malicious users to create
accounts - they at least have to use a valid email address.