#155 Adds lastLogin info for Web Server Auth method

[shanew]

If tiki is setup to use the Web Server (http auth)
authentication method, the user's lastLogin info never
gets updated. This changes the behavior so that
lastLogin is updated (though with this auth method, the
user "logs in" every time they hit a tiki page, which
isn't ideal, but seems better than never changing the
info).

Ideally, it seems like the ws auth should be integrated
into the $userslib->validate_users() function, but that
would be significantly more work.

Also fixed a tiny spelling error.

[shanew]