I see that the Travis-CI builds are failing because the .travis.yml file is missing, and I'm guessing you removed it because Travis wasn't accommodating the rClr installation is missing?
If that's in the ballpark, consider if Wercker is a better fit than Travis. I know very little beyond the basics of Docker, but I'm hoping that you could build a container that has rClr already in it, and therefore test you package. http://www.jimhester.com/2015/04/28/wercker/
I see that the Travis-CI builds are failing because the .travis.yml file is missing, and I'm guessing you removed it because Travis wasn't accommodating the rClr installation is missing?
If that's in the ballpark, consider if Wercker is a better fit than Travis. I know very little beyond the basics of Docker, but I'm hoping that you could build a container that has rClr already in it, and therefore test you package.
http://www.jimhester.com/2015/04/28/wercker/