Added charge method to charge a card with Stripe.js generated token

[stefkohub]

I added this little method to charge a credit card using a Stripe Token generated client side via Stripe.js.

[ghaiklor]

@stefkohub could you write tests for it?

[mikedevita]

also your addition doesn't match the ES6 styling of the rest of the library, minor nit pick IMO...

What is the benefit of your added method vs just using stripePayment.checkout( ) additionally, you're listing _stripeToken as a param yet its not passed into charge()...

shouldn't it be something more like, and im not sure with the stripe-node sdk how to include the token, I think you need to create a customer first. see Using Promises for reference.

  charge(_stripeToken, _options) {
    return new Promise(function (resolve, reject) {
      this.getProvider().charges.create(_options, function (error, result) {
        return error ? reject(error) : resolve(result);
      });
    });
  }