Add ability to stop clustering at specific zoom level

This feature was made possible in OpenLayers (D7) - the ability to have the map stop clustering at a specific zoom level. As a user, I want to cluster results so that I do not have too many map points and to see where events are concentrated, however at a very high zoom level- - for instance 18 - clustering no longer allows the user to click on an event and see event metadata. The user clicks on a cluster and nothing happens. By limiting clustering to, say, zoom level 17 or 16, it then becomes possible to click on individual events.