Add fingerprint grunt task

build/tasks/fingerprint-task.js

@@ -0,0 +1,7 @@
+var fingerprint = require('../../script/utils/fingerprint')
+
+module.exports = function (grunt) {
+  grunt.registerTask('fingerprint', 'Fingerpint the node_modules folder for caching on CI', function () {
+    fingerprint.writeFingerprint()
+  })
+}