Gist does not let me put directories names in file names, so make sure to put:
assets-Gruntfile.js
inassets/Gruntfile.js
assets-package.json
inassets/package.json
project-Grunt.scala
inproject/Grunt.scala
project-JavaScriptBuild.scala
inproject/JavaSCriptBuild.scala
The goal is to let grunt handle everything in the assets directory.