Lists collections at /integrator instead of orders and stock_transfers; Shows orders and
stock_transfers at /integrations/:collection_name
Exposes products as a collection
Formats rspec output
Exposes return_authorization, stock_transfers and users through the API
Uses Spree.user_class in the spec as used in the impl
Sets page=1 when it is absent
Formats the collections output to uses the collection name as an array
Adds updated_at in the product attributes
Fixes specs for the new output.