Clean up during uninstall in commerce_return

After uninstalling commerce_return and commerce_rma there are still several fields, field instances and vocabularies not deleted even after running cron. This makes it impossible to reinstall the modules because you get error messages when they try to create these again.

Vocabularies: return_reason_method
Fields: return_reason_taxonomy_term
Field instances:
commerce_return / commerce_return_line_items / commerce_return,
commerce_return / commerce_return_total / commerce_return,
commerce_return / commerce_customer_rma / commerce_return,
commerce_customer_profile / commerce_customer_address / rma,
commerce_return / commerce_order_reference / commerce_return,
commerce_return_reason / return_reason_product / product,
commerce_return_reason / return_reason_product_type / product_type,
commerce_return_reason / return_reason_taxonomy_term / product,
commerce_return_reason / return_reason_taxonomy_term / product_type,
commerce_return_reason / return_method_taxonomy_term / product,
commerce_return_reason / return_method_taxonomy_term / product_type