Remove & update some dependencies for 2.3.x
Remove deprecated attr_accessible from payment method
Cleanup
Rename MercadoPago.

Conflicts:
	app/models/mercado_pago/client.rb
	app/models/mercado_pago/client/api.rb
	app/models/mercado_pago/client/authentication.rb
	app/models/mercado_pago/client/preferences.rb
	app/models/payment_method/mercado_pago.rb
	spec/models/spree_mercado_pago_client_spec.rb
Change create_preference signature.

Conflicts:
	app/controllers/spree/mercado_pago_controller.rb
Separate preferences' building logic from client.
Remove unused helpers.

Conflicts:
	app/models/mercado_pago/client.rb
Add adjustments to preferences' items.
Convert big decimal to float.

Conflicts:
	spec/spec_helper.rb
Add logging of preferences.
Send title instead of description.

Conflicts:
	app/controllers/spree/mercado_pago_controller.rb
add shipments adjustments
only pass eleible adjustments
Fix specs
New routes for MercadoPago controller
Fix indentation
WIP cleaning things out for new version
WIP More cleanup
Cleaning up MercadoPago controller
Unused views and messages removed
Wip IPN