Merge pull request #1 from Josh-a-e/isomorphic_support

Isomorphic support

Author: Josh-a-e

lib/helpers/ariaAppHider.js

@@ -1,4 +1,4 @@
-var _element = document.body;
+var _element = typeof document !== 'undefined' ? document.body : null;
 
 function setElement(element) {
   if (typeof element === 'string') {
@@ -39,4 +39,3 @@ exports.setElement = setElement;
 exports.show = show;
 exports.hide = hide;
 exports.resetForTesting = resetForTesting;
-