add frontend for logging in via mozilla persona

Conflicts:
	modules/main/templates/_login.inc.php
	thebuggenie/themes/oxygen/oxygen.css
add backend support for logging in via mozilla persona
add frontend for logging in via mozilla persona
allow specifying support for mozilla persona
3.3 upgrade and initialization improvements / fixes
fix persona reloading
minor fix
comment editor improvements
minor change for issue log percentage / milestone
add support for providing gravatar via a module (see issue #2028)
add support for manual-style wiki articles