Re-add stub for try_spree_current_user to orders_controller_spec
showing variants images in the right places fix #2529

Fixes #2538
Add order_id index to spree_payments

Fixes #2536
Move mailer templates to core
[frontend] Remove duplicate money.rb
Remove duplicate base_helper_spec file
Fix comments in core referencing SearchLogic to say Ransack instead
Remove duplicate percent_per_item_spec test
Remove verification_value from parameter logging
Add Classification join model for Product<->Taxon relationship

Fixes #2532
Fix typo, postgrs <-> postgres
Minimum ruby requirement is 1.9.3 [ci skip]
Add spree_frontend and spree_backend into README.md [ci skip]
Bump rubygems requirement to 1.8.25 [ci skip]
Bump rails to 3.2.12
creating order through API as guest #2545
returning correct error message if cannot transition from cart to address
[Fixes #2551] [api] Specs to ensure a user or email can be assigned to an order
Travis test with Ruby 2.0
Convert db seed + sample files to Ruby

This removes some confusion about what countries are in what zone members, and will prevent us from running into issues like #2547