Backport cucumber reporter support to 1.3.x and allow embedding of images

I know that these two features have been lacking for a while now for ruby cucumber. For those like me trying to push BDD and CI having these issues addressed is huge. While I am okay just running from my own fork, it would be excellent to see a point release with these fixes in place while we wait for 2.0 to be ready. 

* Support embedding images directly in HTML and JSON reports ([696](https://github.com/cucumber/cucumber/pull/696),[695](https://github.com/cucumber/cucumber/pull/695/files) @brasmusson)

* Support the cucumber-reporting tools also when using Scenario Outlines ([700](https://github.com/cucumber/cucumber/pull/700) @brasmusson)