Add Chips component

[ajoslin]

Specification: Chips

<material-chips>
  <material-chip ng-repeat="contact in contacts" active="contact.selected">
    <img ng-src="{{contact.img}}">
    <h2>{{contact.name}}</h2>
    <p>{{contact.email}}</p>
  </material-chip>
</material-chips>

Considerations:

• All chips inside are available in the menu.
• All chips that evaluate to active true will be rendered.