simplify csrf token retrieval. remove package.

package.json

@@ -8,7 +8,6 @@
     "bootstrap-sass": "^3.3.7",
     "gulp": "^3.9.1",
     "jquery": "^3.1.0",
-    "js-cookie": "^2.1.2",
     "laravel-elixir": "^6.0.0-9",
     "laravel-elixir-vue": "^0.1.4",
     "laravel-elixir-webpack-official": "^1.0.2",

resources/assets/js/bootstrap.js

 
 window._ = require('lodash');
-window.Cookies = require('js-cookie');
 
 /**
  * We'll load jQuery and the Bootstrap jQuery plugin which provides support
@@ -27,7 +26,7 @@ require('vue-resource');
  */
 
 Vue.http.interceptors.push(function (request, next) {
-    request.headers['X-XSRF-TOKEN'] = Cookies.get('XSRF-TOKEN');
+    request.headers['X-XSRF-TOKEN'] = Laravel.csrfToken;
 
     next();
 });