WIP
persona works for :3001 too
db->users->get_by_email returns user object; "persona_user" field in current_user
minor improvements for current-user view tests
some persona auth improvements
/api/current_user: don't set persona_email unless necessary
bugfixes in register view

also, track "visit /welcome" event only if user is not registered
send $created to mixpanel
Merge branch 'persona-ng'

http://questhub.io/realm/meta/quest/51d41a3e09a095171b000017

Conflicts:
	www/src/views/register.coffee
fix a compilation issue with views/quest/completed
rebuild static