old_contents: (function (app) {
    'use strict';
  
    app.registerModule('tasks');
  })(ApplicationConfiguration);
  
new_contents: 'use strict';
  
  // Use Applicaion configuration module to register a new module
  ApplicationConfiguration.registerModule('tasks', ['core']);
  
  
subject: Write the task.client.module.js in new format. Inject core module to task module.