Add eachChildLayer, an eachLayer implementation. We cannot override eachLayer as we have different behaviour. Doing so makes us add all makers to the map always which is dumb :(

Fixes #102

README.md

@@ -107,6 +107,7 @@ If you are removing a lot of markers it will almost definitely be better to call
 
 ### Other Methods
 ````
+eachChildLayer(method, context): Provides an eachLayer implementation. (eachLayer operates on each visible layer, this method runs on all layers added to the MarkerClusterGroup)
 hasLayer(layer): Returns true if the given layer (marker) is in the MarkerClusterGroup
 zoomToShowLayer(layer, callback): Zooms to show the given marker (spidifying if required), calls the callback when the marker is visible on the map
 addLayers(layerArray): Adds the markers in the given array from the MarkerClusterGroup in an efficent bulk method.

src/MarkerClusterGroup.js

@@ -230,6 +230,20 @@ L.MarkerClusterGroup = L.FeatureGroup.extend({
 		return bounds;
 	},
 
+	//Don't override LayerGroup.eachLayer, but provide the same functionality for external users
+	eachChildLayer: function (method, context) {
+		var markers = this._needsClustering.slice(),
+		    i;
+
+		if (this._topClusterLevel) {
+			this._topClusterLevel.getAllChildMarkers(markers);
+		}
+
+		for (i = markers.length - 1; i >= 0; i--) {
+			method.call(context, markers[i]);
+		}
+	},
+
 	//Returns true if the given layer is in this MarkerClusterGroup
 	hasLayer: function (layer) {
 		if (this._needsClustering.length > 0) {