Bring in new version of analytics

Only uses Universal now.

Classic was included in the new API initially to
support older implementations but was removed in
alphagov/govuk_frontend_toolkit#194.

app/assets/javascripts/_analytics.js

@@ -3,7 +3,7 @@
   GOVUK.Tracker.load();
   var cookieDomain = (document.domain === 'www.beta.digitalmarketplace.service.gov.uk') ? '.digitalmarketplace.service.gov.uk' : document.domain;
   var property = (document.domain === 'www.digitalmarketplace.service.gov.uk') ? 'UA-49258698-1' : 'UA-49258698-3';
-  GOVUK.analytics = new GOVUK.Tracker({
+  GOVUK.analytics = new GOVUK.Analytics({
     universalId: property,
     cookieDomain: cookieDomain
   });

app/assets/javascripts/application.js

@@ -1,7 +1,6 @@
 //= include ../../../node_modules/govuk_frontend_toolkit/javascripts/vendor/polyfills/bind.js
-//= include ../../../node_modules/govuk_frontend_toolkit/javascripts/govuk/analytics/tracker.js
+//= include ../../../node_modules/govuk_frontend_toolkit/javascripts/govuk/analytics/analytics.js
 //= include ../../../node_modules/govuk_frontend_toolkit/javascripts/govuk/analytics/google-analytics-universal-tracker.js
-//= include ../../../node_modules/govuk_frontend_toolkit/javascripts/govuk/analytics/google-analytics-classic-tracker.js
 //= include ../../../bower_components/jquery/dist/jquery.js
 //= include ../../../bower_components/digitalmarketplace-frontend-toolkit/toolkit/javascripts/option-select.js
 //= include _analytics.js'

package.json

@@ -13,7 +13,7 @@
     "gulp-shell" : "0.2.9",
     "gulp-filelog" : "0.4.1",
     "gulp-include": "1.1.1",
-    "govuk_frontend_toolkit" : "3.5.1"
+    "govuk_frontend_toolkit" : "4.1.1"
   },
   "scripts": {
     "frontend-install": "./node_modules/bower/bin/bower install",