add liscense to js files

js/bootstrap-alerts.js

@@ -1,3 +1,23 @@
+/* ==========================================================
+ * bootstrap-alerts.js
+ * http://twitter.github.com/bootstrap/javascript.html#alerts
+ * ==========================================================
+ * 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.
+ * ========================================================== */
+
+
 (function( $ ){
 
   /* CSS TRANSITION SUPPORT (https://gist.github.com/373874)