CB Paid Subscriptions

Transparent Redirect partially implemented now. Token is being generated. Form is being modified appropriately to POST to PayPal. PayPal is redirecting back appropriately. If Buyer Authentication is enabled PayPal in theory is supposed to redirect to the bank for authentication then back to CBSubs. Needs further implementation as the processing of payments needs to be entirely skipped based off the response data sent back by PayPal.

Recurring payments need further work as the token generated can be single payments or recurring payments. In cases where user has choice of single or recurring it won't work correctly.

Implemented in MR !155