v0.2.4: Custom Checkout Fields and CVV2

CHECKOUT:
- Text has changed (and changed locations) for the email and password fields. Minor stylesheet tweak made to handle the new text.
- Tax is calculated based on shipping address (when available), rather than billing address.
- Tax starts as $0 on checkout, and updates when necessary.
- Added CVV2 error checking.
- Added custom form fields using ^^custom_begin^^ and ^^custom_end^^
Functionality:
- Added custom form field option to the checkout template using ^^custom_begin^^ and ^^custom_end^^

Questions?

Love it? Hate it? Have questions or comments? Let us know!