code: function optimizeBootModules () {
  			grunt.log.writeln('OK'.green);
  			if (!options.dirs || !options.dirs.length) {
  				finalize();
  				return;
  			}
  			grunt.util.async.forEachSeries(options.dirs, function(dir, next) {
  				if (typeof dir === 'string') {
  					dir = {
  						combine: false,
  						name: dir
  					}
  				}
  				optimizeDir(dir, next);
  			}, function () {
  				finalize();
  			});
  		}
docs: STEP 3: Optimize boot modules (there are no references onto them but they also should be optimized)