maurymmarques/postmark-cakephp — pull request #10 by planardothum (2014-06-17 17:31:24+00:00)
Title: Allow Flag to be set to enable tracking on email.

Postmark app has added [Open](http://blog.postmarkapp.com/post/87919491263/open-tracking-is-finally-here) tracking to see when emails have been opened. You enable this through a flag sent with your message.
This change allows you to set this flag with your configuration:

```
class EMailConfig {
public $postmark = array(
'transport' => 'Postmark.Postmark',
'uri' => 'http://api.postmarkapp.com/email',
'key' => 'POSTMARK_KEY',
'TrackOpens' => true
);
}
```