Bug 974864: [MMS]Pick recipient(email adress) up from contacts app

https://bugzilla.mozilla.org/show_bug.cgi?id=974864
do:

```javascript
var contactProperties = ['tel'];
if (Settings.supportEmailRecipient) {
  contactProperties.push('email');
}

var activity = new MozActivity({
  name: 'pick',
  data: {
    type: 'webcontacts/select',
    contactProperties: contactProperties
  }
});
```