upgrade es5-shim

bower.json

@@ -16,7 +16,7 @@
     "jquery-ui": "~1.10.3",
     "bootstrap": "http://getbootstrap.com/2.3.2/assets/bootstrap.zip",
     "jquery-tabby": "git://github.com/alanhogan/Tabby",
-    "es5-shim": "~2.1.0",
+    "es5-shim": "~3.2.0",
     "codemirror": "~3.20.0",
     "showdown": "~0.3.1",
     "require-css": "~0.0.8"