Adds pinger attribute to Group and pingable_groups to User.
Group administrator can now allow other users to ping the group.
Tweaks to status code and removes xhr check for group applications.
Group administrator can now reject an application.
Adds some forgotten security decorators.
Fixes make_admin javascript method.
Group administrators can now remove other group administrators.
Cleaning evetools.
Group administrators can now remove ping right from a member.
Adds group editing.