Checkout, Account holder and login updates

1. Fixed multiple PHP Undefined index errors
2. Consolidated the plans into the domains session data
3. Added button to account section to add new domain and plan.
4. Updated checkout login to work with [2].
Merge branch 'master' of https://github.com/basekit/partner-php

Conflicts:
	library/PartnerWeb/Controller/CheckoutController.php
Added some of Mickeys upgrade changes and finished the upgrade code example.