Expire the cache for the query

[bradmartin]

Come up with an elegant way to expire (bustCache) for a query.

Could expose a public method allowing the url to be passed, check storage for that url and delete from storage.

Could also toggle a public boolean during an event (onItemsSet or onItemSelect) that deletes an item from the queue.

[bradmartin]

Public method to delete an item or all items added.

Still need to think about a specific expiration for each key.