Adding VBO action to refresh an item in the queue.
Adding implementation of hook_salesforce_queue_refresh_queue_item().

This function will regenerate a queue item for a webform submission
whenever the refresh item VBO action is used on the queue view.
Adding test coverage for VBO refresh item action.
Adding support for refreshing donation objects in the queue.
Adding support for refreshing entities in the queue.
Merge pull request #442 from JacksonRiver/7.x-4.x-rebuild_queue_item_action

Adding VBO Refresh Item action to Salesforce queue view.