chore(package): renamed the build script from "start" to "build" for circleci

Author: AnthonyNahas

package.json

@@ -25,7 +25,7 @@
   },
   "private": true,
   "scripts": {
-    "start": "gulp build",
+    "build": "gulp build",
     "test": " gulp test",
     "demo": " gulp build:demo",
     "check-travis": " travis-status --repo=angular-material-extensions/google-maps-autocomplete --branch=master --fail-pending || echo 'Not yet passing'"