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[#1187] Add Stripe Integration to Customer Checkout Route

Integrate the Customer Place Order API Route with Stripe. When an Order
is placed, a Stripe Customer will be created if the Customer does not
have one. Then we create a Stripe Card for the Stripe Customer & set the
proper billing address for it. Once the Order is created, we charge the
Stripe Customer.

• Add an optional stripeId field to the Customer model.
• Add an optional stripeChargeId field to the Order model.
• Add a `toStripeAmount` function for converting between `Cents` &
  Stripe `Amounts`.
• Add Persistent Fields for Stripe Customer & Charge IDs.
• Add a helper function for running Stripe requests in the `App` monad.
• Modify the customerPlaceOrderRoute to create a Stripe Customer, Card,
  & Charge.
• Modify the OrderStatus type to include Payment statuses.
• Modify the Config & Main modules to parse & store a Stripe API Token.
• Modify the createOrder function so that it does not remove the
  Customer's Cart.
• Modify the createLineItems function to return the total of all created
  items.
• Modify the createProducts function to return the total of all created
  products.

Refs #1187

[#1187] Add Stripe Integration to Anonymous Customer Checkouts

When unregistered Customers checkout, create a Stripe Customer, Card, &
Charge for their Order just like for registered Customers.

Refs #1187