package.json + run gulp

package.json

@@ -7,6 +7,7 @@
   "scripts": {
     "start": "babel-node src/index.js",
     "out": "babel src/ -d out/",
+    "gulp": "gulp",
     "test": "mocha --compilers js:babel-register",
     "coverage": "istanbul cover mocha -- --compilers js:babel-register"
   },