Add NPM and CommonJS compatibility.

package.json

@@ -9,7 +9,7 @@
       "email": "me@noraesae.net"
     }
   ],
-  "main": "out/js/perfect-scrollbar.js",
+  "main": "src/js/main.js",
   "repository": {
     "type": "git",
     "url": "https://github.com/noraesae/perfect-scrollbar"

src/js/main.js

@@ -0,0 +1,6 @@
+/* Copyright (c) 2015 Hyunje Alex Jun and other contributors
+ * Licensed under the MIT License
+ */
+'use strict';
+
+module.exports = require('./plugin/ps');