Added OnCameraChangeDownstreamListener to allow camera changes to be propagated.

library/src/com/twotoasters/clusterkraf/ClusteringOnCameraChangeListener.java

@@ -31,6 +31,11 @@ public void onCameraChange(CameraPosition newPosition) {
 				host.onClusteringCameraChange();
 			}
 		}
+
+        if (options.getOnCameraChangeDownstreamListener() != null) {
+            options.getOnCameraChangeDownstreamListener().onCameraChange(newPosition);
+        }
+
 	}
 
 	public void setDirty(long when) {

library/src/com/twotoasters/clusterkraf/OnCameraChangeDownstreamListener.java

@@ -0,0 +1,12 @@
+package com.twotoasters.clusterkraf;
+
+import com.google.android.gms.maps.GoogleMap;
+
+/**
+ * Because Clusterkraf must set its own OnCameraChangeListener on the
+ * GoogleMap it is managing, and because the GoogleMap can only have one
+ * OnCameraChangeListener, Clusterkraf passes the event downstream to its
+ * users.
+ */
+public interface OnCameraChangeDownstreamListener extends GoogleMap.OnCameraChangeListener {
+}

library/src/com/twotoasters/clusterkraf/Options.java

@@ -47,6 +47,12 @@ public class Options {
 	 */
 	private MarkerOptionsChooser markerOptionsChooser;
 
+    /**
+     * The OnCameraChangeDownstreamListener to receive callbacks when the map camera
+     * changes.
+     */
+    private OnCameraChangeDownstreamListener onCameraChangeDownstreamListener;
+
 	/**
 	 * The OnMarkerClickDownstreamListener to receive callbacks when a marker is
 	 * clicked
@@ -367,7 +373,15 @@ public void setProcessingListener(ProcessingListener processingListener) {
 		this.processingListener = processingListener;
 	}
 
-	public enum ClusterClickBehavior {
+    public OnCameraChangeDownstreamListener getOnCameraChangeDownstreamListener() {
+        return onCameraChangeDownstreamListener;
+    }
+
+    public void setOnCameraChangeDownstreamListener(OnCameraChangeDownstreamListener onCameraChangeDownstreamListener) {
+        this.onCameraChangeDownstreamListener = onCameraChangeDownstreamListener;
+    }
+
+    public enum ClusterClickBehavior {
 		ZOOM_TO_BOUNDS, SHOW_INFO_WINDOW, NO_OP
 	}