Fixed global IPython namespace.

IPython/html/static/base/js/namespace.js

@@ -1,8 +1,8 b''
 // Copyright (c) IPython Development Team.
 // Distributed under the terms of the Modified BSD License.
 
+var IPython = IPython || {};
 define([], function(){
-    var IPython = IPython || {};
     IPython.version = "3.0.0-dev";
     return IPython;
 });