Gist does not let me put directories names in file names, so make sure to put:
assets-Gruntfile.jsinassets/Gruntfile.jsassets-package.jsoninassets/package.jsonproject-Grunt.scalainproject/Grunt.scalaproject-JavaScriptBuild.scalainproject/JavaSCriptBuild.scala
The goal is to let grunt handle everything in the assets directory.