Attempt to fix ability.
Drop Spree 1.3.x support in favor of 2.x for split shipments.
Major Work In Progress - Still broken are: abilities, supplier admin ui, emails.
WIP - Fix SupplierAbility. Still broken: Admin UI & Emails.
Fix edit supplier spec.
Cleanup supplier welcome email.
WIP - Cleanup emails.
Merge branch 'master' of https://github.com/jdutil/spree_drop_ship