Add heroku pre post build scripts

Author: mts

package.json

@@ -3,6 +3,8 @@
   "version": "0.0.0",
   "description": "Codestar Streams",
   "scripts": {
+    "heroku-prebuild": "echo This runs before Heroku installs your dependencies.",
+    "heroku-postbuild": "npm run install-packages",
     "start": "lerna run serve --stream",
     "test": "lerna run test --stream",
     "build": "lerna run build --stream",