removing define module name as it breaks aliasing the module name

Author: adamcarr

dist/showdown.js

@@ -6,7 +6,7 @@ if (typeof module !== 'undefined' && module.exports) {
 
 // AMD Loader
 } else if (typeof define === 'function' && define.amd) {
-  define('showdown', function () {
+  define(function () {
     'use strict';
     return showdown;
   });