Scala test fw

First attempt to use the inhouse Scala testing framework with one test for checking the picture overlay functionality. Keep in mind that I am a beginner Scala dev so code will likely look very "Javaish"
I dont understand this comment. Are those files supposed to be in git? Because when I did a merge and the usual chain of npm install and grunt compile I got tons of files under there which were not under source control so I assumed those were generated.