add liscense to js files

js/bootstrap-dropdown.js

@@ -1,7 +1,24 @@
-(function( $ ){
+/* ============================================================
+ * bootstrap-dropdown.js
+ * http://twitter.github.com/bootstrap/javascript.html#dropdown
+ * ============================================================
+ * Copyright 2011 Twitter, Inc.
+ *
+ * Licensed under the Apache License, Version 2.0 (the "License");
+ * you may not use this file except in compliance with the License.
+ * You may obtain a copy of the License at
+ *
+ * http://www.apache.org/licenses/LICENSE-2.0
+ *
+ * Unless required by applicable law or agreed to in writing, software
+ * distributed under the License is distributed on an "AS IS" BASIS,
+ * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+ * See the License for the specific language governing permissions and
+ * limitations under the License.
+ * ============================================================ */
 
- /* DROPDOWN PLUGIN DEFINITION
-  * ========================== */
+
+(function( $ ){
 
   var selector = 'a.menu, .dropdown-toggle'
 
@@ -13,6 +30,9 @@
     $('body').bind("click", clearMenus)
   })
 
+  /* DROPDOWN PLUGIN DEFINITION
+   * ========================== */
+
   $.fn.dropdown = function ( options ) {
     return this.each(function () {
       $(this).delegate(selector, 'click', function (e) {