add equals() function to OpenLayers.Bounds. plus test

git-svn-id: http://svn.openlayers.org/trunk/openlayers@389 dc9f47b5-9b13-0410-9fdd-eb0c1a62fdaf

lib/OpenLayers/Util.js

@@ -267,6 +267,18 @@ OpenLayers.Bounds.prototype = {
                                      this.right, this.top);
     },
 
+    /** 
+    * @param {OpenLayers.Bounds} bounds
+    * @returns Boolean value indicating whether the passed-in OpenLayers.Bounds
+    *          object has the same left, right, top, bottom components as this
+    *
+    * @type bool
+    */
+    equals:function(bounds) {
+        return ((this.left == bounds.left) && (this.right == bounds.right) &&
+                (this.top == bounds.top) && (this.bottom == bounds.bottom));
+    },
+
     /** 
     * @return String representation of OpenLayers.Bounds object. 
     *         (ex.<i>"left-bottom=(5,42) right-top=(10,45)"</i>)