Fix some code style issues

test/usageTests/browserifyUsage.js

@@ -1,6 +1,6 @@
 /**
  * Created by knut on 14-12-02.
  */
-mermaid = require('mermaid')
+const mermaid = require('mermaid')
 
 console.log('Test page! mermaid version' + mermaid.version())

test/usageTests/reqJsApp.js

@@ -1,3 +1,4 @@
+/* eslint-env qunit */
 require.config({
   paths: {
     mermaid: '../../dist/mermaid'

test/usageTests/simple.js

@@ -1,9 +1,9 @@
 /**
  * Created by knut on 15-03-07.
  */
-define('simple', function () {
-  var simple = {
-    data: 'info'
-  }
-  return simple
-})
+// define('simple', function () {
+//   var simple = {
+//     data: 'info'
+//   }
+//   return simple
+// })