Echo testing errors

There was an error causing the FxA reverification timeout/500 tests to fail. This adds some logging so that we can notice when errors are happening.

We get a bunch of errors that have `INVALID_STATE_ERR` in them, these appear to come from forcing timeouts. I couldn't come up with a way of preventing the error so I made it just log the message.

![screenshot 2014-10-24 11 44 19](https://cloud.githubusercontent.com/assets/211578/4772935/205d1304-5b9d-11e4-8a43-2e69dd467da4.png)
> Error occurred

![screenshot 2014-10-24 11 44 02](https://cloud.githubusercontent.com/assets/211578/4772936/2063ef26-5b9d-11e4-8174-4e21c173b1a8.png)
> Error fixed
This looks like it will fix bug 1050562 [1]

[1] https://bugzilla.mozilla.org/show_bug.cgi?id=1050562