Run with:

    PUBLISHABLE_KEY=pk_test_4aZnwTrOtTfNSxs8KtI1a3LC SECRET_KEY=sk_test_4aZnq9QgKUcJ2cPp9dGaidOT python app.py

Run with:

    PUBLISHABLE_KEY=pk_test_4aZnwTrOtTfNSxs8KtI1a3LC SECRET_KEY=sk_test_4aZnq9QgKUcJ2cPp9dGaidOT python app.py

Good reads:

- https://eff.iciently.com/blog/stripe_checkout.html
- http://www.jeffknupp.com/blog/2014/01/18/python-and-flask-are-ridiculously-powerful/

Add good reads to the readme
Add good reads to the readme
