Merge pull request #115 from nicholaswyoung/master

Fix 'undefined module' error in lib/browser.js

lib/browser.js

@@ -549,7 +549,7 @@ hawk.crypto.internals = CryptoJS;
 
 // Export if used as a module
 
-if (module && module.exports) {
+if (('undefined' !== typeof(module)) && module.exports) {
     module.exports = hawk;
 }