Two factor authentification support for logins + more

A basic installer (deep deep development, I just started working on
it), two factor support for logins (need to be added manually through
the database until we have an UCP or a similar place where people could
enable it manually.

verify.php generates keys and is a basic debugger for testing tokens,
while onetime.php just generates keys.

This uses a PHP class developed by idontplaydarts.com and has a
separate table in the database :)
Merge branch 'area51' of https://github.com/pulsir/pulsir into area51

Conflicts:
	_class/cms_class.php
	api/get.php
	api/user.php