title: How to include failed screenshots into the codeception report
body: <p>Just started using codeception 2.0.9 and have installed it with phantomjs and got some sample tests running.</p>
  
  <p>Codeception gives a concise html report at the end that summarises passed tests in red and green, which is nice.
  In the reporting directory there is also a screenshot of failed tests, e.g. ExampleCest.CheckLabel.fail.png ExampleCest.CheckLabel.fail.html</p>
  
  <p>Question, how can these be (automatically) linked into report.html so that one can see the failed screenshots from the report in the browser?</p>