title: Two way binding between components in angular 2-4
body: <p>I would like the child component value to be bound to the parent component. How to accomplish this when <code>@Input()</code> and <code>[(ngModel)]</code> are not enough ?</p>
  
  <p><a href="https://plnkr.co/edit/qPFxZRcWINPse5F2TVaP?p=preview" rel="noreferrer">here is a plunker</a></p>