Initial implementation

Fixing notification

Moar work
Add forward_url
Adding tests

More tests

More tests and fixes

Added tests
Review feedback addressed
Rename x_id
Data fix for test
Fix forward URL
Use existing terms for x_result
Adjust formatting
Merge pull request #1091 from Shopify/universal_offsite_hackdays

Universal Offsite API
Litle: Remove dependency on the Litle gem

Closes #1094.
Litle: Fix case of missing address parts

Litle doesn't like it if you specify an empty country for example.

Closes #1101.
Update CHANGELOG
Merge pull request #1103 from Shopify/update_changelog

Update CHANGELOG
Add currencies to Iridium
Merge pull request #1102 from Shopify/iridium_currencies

Add currencies to Iridium
Bump version; Update CHANGELOG
Merge pull request #1104 from Shopify/release_1428

Release v1.42.8
Spreedly: Add support for more optional fields

Specifically ip, description and gateway_specific_fields.

Closes #1097.
Add american express to supported cards in Pin Gateway