Don't build on Heroku; build on Travis and deploy the result

.travis.yml

@@ -9,6 +9,7 @@ deploy:
   api_key:
     secure: XFI5BjFCHRn3egUWApYlK0A3bi3dIRmKUNTzd3frqIYNXJE6jx4nDudf/vyiqrahYuZthZVZYC8dNw8kkFPsRpqCEwh53KnvEDQehEMoII4q5qwEGIz4zI/EjAcnLyEXYv/VDipOhzLonQAw0OpFDcoQwtTl3iJ9ACW6+K2oIWnf2J+5cHbKqsCBw+b9p7vOEqln6L/dkfnajj9dqndsnCvVX47LoRbtvCmHRjSEl/UGK9HMQDv/1F60O8pQJWDF6So7AqBoX1OBVSEMSomlLHZtPZGVKCZOynIJIicd0PyEzG9pUVOyYUNCurlCMFgHzDOKSiw+8QOS1+YAcA3mNZoWtAotMSoUlU/IgATyZ075IDboQp4WGO+49VhQ07r86/v8F4uZWidontVwEUhx7pg+p7jWrV8hvV8wFICCDOH15TVkO8ilNGQp39qyFADKTkZv0pFy1UqsABvp8tXX7DZ6h9G+V5aY2hOf40bbAWvQZ1t9oEVcikkrOW/9qEfV5Mk9zioqmR/IXlgLAYL2BqIKC/a6RVPKQYB7y3nrjzA/Oi8gJyfgPo6VCdhPCIUF2xAXLiymV8LBmdiJSp3SYl72ffNB/urKPNBpNtwUEqTCoZBK15EA6+++kHszcbKRLKpNWnQlLgwePT+jucQtiDCCUIb4vlW3TyonO7s/Gb0=
   app: serviceworker-cookbook
+  skip_cleanup: true
   on:
     repo: mozilla/serviceworker-cookbook
     branch: master

package.json

@@ -4,7 +4,7 @@
   "description": "It's online. It's offline. It's a Service Worker!",
   "private": true,
   "scripts": {
-    "start": "gulp build && node --harmony server.js",
+    "start": "node --harmony server.js",
     "test": "gulp test",
     "watch": "gulp watch",
     "build": "gulp build"