Add Payment Support via Stripe

[dannysmith]

Initially, this should just be a template setup to make recurring revenue easy.

The source code of koudoku (or maybe the gem itself) will probably be useful.

Remember: KISS.

Other things to Consider

• Admin panel reporting on revenue.
• User section (for users who have credit cards/billing provelages) showing invoices and upcomming bills etc.

[dannysmith]

This may be a useful article: https://reinteractive.com/posts/357-managing-stripe-subscription-payments-in-rails