Stripe payments - WIP

Work in Progress, but I figured I'd open the request now. Right now, just putting certain things in the backend.  The Access Token is for Developers (Gotten through OAuth).  The Customer Token is an id to identify a customer in Stripe (so, if we would like to 'save' a user's payment details, we will save their stripe customer id).  More details on shared customers [here]( https://stripe.com/docs/connect/shared-customers)

Will be going into navigator.game and I will add to this pull request when it is done.