Add order_id to Stripe metadata
Make a non_fractional_currency? accessor public
add test for public non_fractional_currency? accessor
Merge pull request #1390 from Shopify/fractional_currency_accessor

Make a non_fractional_currency? accessor public
Merge pull request #1388 from Shopify/stripe_metadata

Add order_id to Stripe metadata
Add Checkout.com

https://www.checkout.com/

Closes #1343.
HPS: Add verify support

Closes #1375.
Fix warnings in Eway Rapid tests
Add Bank Frick

http://www.bankfrickacquiring.com/

Closes #1380.
Add Global Transport gateway

https://www.globalpaymentsinc.com

Closes #1382.
iATS: Add #store and #unstore

Also removed stubbed out #authorize, #capture, and #void since they're
not supported and weren't functioning anyway.

Closes #1389.
DIBS Payment Services

This commit is maintained separate until DIBS setup a sandbox.
Code by @maxwhite