title: moment is not defined Angular Material DateTimePicker
body: <p>I'm using webpack and I can not include Angular Material DateTimePicker.
  I get error 
  bundle.js:50702 Uncaught ReferenceError: moment is not defined</p>
  
  <p>module.exports = angular.module("app.main", [
    .....
    require('angular-material-datetimepicker'),
    ....</p>