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Changes proposed in this Pull Request:

Geocodes the address before the level changes so that we don't lose the billing address fields when going offsite to Stripe Checkout

Resolves #63

How to test the changes in this Pull Request:

1. Ensure Stripe Checkout is your chosen gateway
2. Checkout with the standard billing fields enabled
3. The address should be gecoded before being redirected to Stripe's Checkout page

Other information:

• Have you added an explanation of what your changes do and why you'd like us to include them?
• Have you successfully run tests with your changes locally?

Changelog entry

Fixed a bug where the billing address doesn't get geocoded when using Stripe Checkout