Updated coding styles and test configs

config/jest/cssTransform.js

@@ -1,4 +1,3 @@
-'use strict';
 
 // This is a custom Jest transformer turning style imports into empty objects.
 // http://facebook.github.io/jest/docs/en/webpack.html

config/jest/fileTransform.js

@@ -1,4 +1,3 @@
-'use strict';
 
 const path = require('path');