Update package.json version and use new @preserve tag for uglify

Author: lokesh

package.json

@@ -1,6 +1,6 @@
 {
   "name": "lightbox2",
-  "version": "2.8.2",
+  "version": "2.9.0",
   "author": "Lokesh Dhakar <[email protected]>",
   "description": "The original Lightbox script. Uses jQuery.",
   "keywords": [

src/js/lightbox.js

@@ -8,6 +8,8 @@
  * Copyright 2007, 2015 Lokesh Dhakar
  * Released under the MIT license
  * https://github.com/lokesh/lightbox2/blob/master/LICENSE
+ *
+ * @preserve
  */
 
 // Uses Node, AMD or browser globals to create a module.