Update build

dist/leaflet.markercluster-src.js

@@ -1035,9 +1035,28 @@ L.MarkerCluster = L.Marker.extend({
 		return this._childCount;
 	},
 
-	//Zoom to the extents of this cluster
+	//Zoom to the minimum of showing all of the child markers, or the extents of this cluster
 	zoomToBounds: function () {
-		this._group._map.fitBounds(this._bounds);
+		var childClusters = this._childClusters.slice(),
+			map = this._group._map,
+			boundsZoom = map.getBoundsZoom(this._bounds),
+			zoom = this._zoom + 1,
+			i;
+
+		while (childClusters.length > 0 && boundsZoom > zoom) {
+			zoom++;
+			var newClusters = [];
+			for (i = 0; i < childClusters.length; i++) {
+				newClusters = newClusters.concat(childClusters[i]._childClusters);
+			}
+			childClusters = newClusters;
+		}
+
+		if (boundsZoom > zoom) {
+			this._group._map.setView(this._latlng, zoom);
+		} else {
+			this._group._map.fitBounds(this._bounds);
+		}
 	},
 
 	getBounds: function () {
@@ -1717,6 +1736,8 @@ L.MarkerCluster.include({
 				delete m._spiderLeg;
 			}
 		}
+
+		group._spiderfied = null;
 	}
 });
 
@@ -1959,10 +1980,9 @@ L.MarkerClusterGroup.include({
 
 		if (this._map.options.zoomAnimation) {
 			this._map.on('zoomstart', this._unspiderfyZoomStart, this);
-		} else {
-			//Browsers without zoomAnimation don't fire zoomstart
-			this._map.on('zoomend', this._unspiderfyWrapper, this);
 		}
+		//Browsers without zoomAnimation or a big zoom don't fire zoomstart
+		this._map.on('zoomend', this._noanimationUnspiderfy, this);
 
 		if (L.Path.SVG && !L.Browser.touch) {
 			this._map._initPathRoot();