Add Payment view

[KwikKill]

I think it's finally time to work on this front hot topic.
Currently, player have a "Pay" button in two scenarios. When a registration is made (choice between "continue" and "continue and pay") and in the Me view when user hasn't already paid.

Therefore, we need to add :

• A payment view that take a product in url parameter and redirects to the good urls to proceed.
• A message that tell the user the payment status at the end (can be on the same view).