fix(trackers): lifecycle hook error

window.ga was initialized after plugin api causing an error for a missing ga property

closes #106

Author: MatteoGabriele

src/create-trackers.js

@@ -6,13 +6,6 @@ import { getTracker } from './helpers'
 export default function createTrackers () {
   const ids = getId()
 
-  if (!window.ga) {
-    window.ga = window.ga || function () {
-      (ga.q = ga.q || []).push(arguments)
-    }
-    ga.l = Number(new Date())
-  }
-
   if (config.debug.enabled) {
     window.ga_debug = {
       trace: config.debug.trace

src/index.js

@@ -9,6 +9,13 @@ import analyticsMiddleware from './vuex-middleware'
 export default function install (Vue, options = {}) {
   update(options)
 
+  if (!window.ga) {
+    window.ga = window.ga || function () {
+      (window.ga.q = window.ga.q || []).push(arguments)
+    }
+    window.ga.l = Number(new Date())
+  }
+
   Vue.directive('ga', ga)
 
   Vue.prototype.$ga = Vue.$ga = lib