Merge pull request #357 from jgillman/add-response-content-error-for-ups

Add ResponseContentError for raised UPS error

lib/active_shipping/carriers/ups.rb

@@ -194,7 +194,7 @@ def create_shipment(origin, destination, packages, options = {})
       xml = parse_ship_confirm(confirm_response)
       success = response_success?(xml)
       message = response_message(xml)
-      raise message unless success
+      raise ActiveShipping::ResponseContentError, StandardError.new(message) unless success
       digest  = response_digest(xml)
 
       # STEP 2: Accept. Use shipment digest in first response to get the actual label.