Fix window.location.path -- should be pathname

Author: justinhaaheim

404.html

@@ -33,7 +33,7 @@
       // eg "https://facebook.github.io/flux/docs/overview/"
       const ORIGINAL_URL = window.location.href;
       // eg [ "", "flux", "docs", "overview", "" ]
-      const PATH_PARTS = window.location.path.split('/');
+      const PATH_PARTS = window.location.pathname.split('/');
       // eg "flux"
       const PROJECT = PATH_PARTS[1];
       // eg "docs/overview/"