Support coveralls code coverage

[jgoppert]

I've integrated industrial_ci with coveralls here, not sure if you can clean it up and pull the functionality into industrial_ci, would be nice if this was an out of the box feature. I had to do some funky things with the after script and dumping some extra variables into the docker env to get it to work.

https://github.com/dronecrew/ros_ci

[130s]

Thanks for the headsup. As #112, adding coverage report has been in the todo stack, so sooner or later someone would add that feature.
Not sure what you intended with your package, would you mind opening a pull request against industrial_ci?