Merge pull request #10 from gmacdougall/2-3-dev

fix ignore_types to work with FlashHash in rails 4.1
Merge pull request #11 from gmacdougall/2-3-dev

Fix payment state logic
Merge pull request #12 from gmacdougall/2-3-dev

Refactor gateway options to its own class.
Indexing the guest_token column on spree_orders

Closes #5648