Poll Anything, all in one handy bit-sized commit.

Conflicts:
	app/controllers/spree/api/integrator_controller.rb
	app/views/spree/api/integrator/index.v1.rabl
	spec/controllers/spree/api/integrator_controller_spec.rb
Keeps compatibility for old versions of spree_hub_connector (before
poll anything)
Merge branch '1-3-stable' into 1-3-poll-anything

Conflicts:
	app/controllers/spree/api/integrator_controller.rb
	spec/controllers/spree/api/integrator_controller_spec.rb
Spree 1-3 doesn't have a StockTransfer
Run specs on postgres
Update user stubs to fix authorization failures in specs