Implement _services_queue_remove_from_queue()

[signalpoint]

This queue never gets cleared out. One detriment of this is we can never force a reset on loading an entity from local storage, except one time during the app's life cycle.

[signalpoint]

This actually isn't needed, because the queue already gets cleared out by jDrupal. But if someone has an error in their success callback (e.g. during a node_load()) the queue won't get cleared out.