Ignore phantomjs "Operation canceled" error message that happens on mult...

...iple page loads (ajax requests).

The issue I am experiencing right now is related to phantomjs throwing 'Operation canceled' on too many ajax requests on a single page load. This happens when test suite is large enough and there are seriously quite a lot of ajax requests being performed in it.

And it just so happens that `onLoadFinished` is invoked with status `fail` while `window.Teaspoon` is defined and test cases can be run correctly. I would like to exclude phantomjs' status as a criteria of failure because it seems unreliable and `window.Teaspoon` seems to be enough. 

P.S. Someone did research on how many requests is allowed https://groups.google.com/forum/#!topic/phantomjs/Tg-Jq-cmuVo