code: function build(outputDir) {
      let exec = require("child_process").exec;
      let elmFile = path.join(argv.src, argv.elmFile);
      let cmd = "elm-make " + elmFile + " --yes --output " + argv.output + "/" + argv.language + ".js";
      console.log(cmd);
      exec(cmd, (err, stdout, stderr) => {
          if(err) {
              console.error(err);
              return;
          }
          console.log(stdout);
      });
  }
docs: build - Builds the elm app with the current language.
  
  @param  {type} outputDir The directory to which the elm build should be written.
  Files will be named according to the current language