*client_admin signs up
*system saves client_admin and company in user_approval and company_approval tables
*system sends mail to client_admin informing that is waiting approval
*system sends mail to admin informing that has a client_admin waiting approval
*admin confirm client_admin
*system saves client_admin and company in login_user and company tables
*system sends mail to client_admin informing that was approved
*client_admin logs in
*client_admin adds client_user
*system saves client_user with password=null and is_enabled=false (where? user_approval or login_user?)
*system sends mail to client_user with link to set password
*client_user sets password
*system save password and set is_enabled=true
*client_user logs in

http://mingle.intra.sears.com/projects/contest_and_sweepstakes/cards/2917
http://mingle.intra.sears.com/projects/contest_and_sweepstakes/cards/2921