Applied Corey Puffault's zoomToExtent() patch from #107.

git-svn-id: http://svn.openlayers.org/trunk/openlayers@789 dc9f47b5-9b13-0410-9fdd-eb0c1a62fdaf

lib/OpenLayers/Map.js

@@ -552,6 +552,14 @@ OpenLayers.Map.prototype = {
         );
     },
 
+    zoomToExtent: function(bounds) {
+        this.setCenter(
+          new OpenLayers.LonLat((bounds.left+bounds.right)/2,
+                                (bounds.bottom+bounds.top)/2),
+          this.getZoomForExtent(bounds)
+        );
+    },
+
     /**
     * @param {OpenLayers.LonLat} lonlat
     * @private