UI improvements for the tutorial:

- Have a show sudo checkbox which defaults to on for linux
  - Have the repository name be highlighted in a light blue bubble/chit

static/js/controllers.js

@@ -49,9 +49,13 @@ function PlansCtrl($scope, $location, UserService, PlanService) {
 }
 
 function TutorialCtrl($scope, AngularTour, AngularTourSignals, UserService) {
+  // Default to showing sudo on all commands if on linux.
+  var showSudo = navigator.appVersion.indexOf("Linux") != -1;
+
   $scope.tour = {
     'title': 'Quay.io Tutorial',
     'initialScope': {
+      'showSudo': showSudo
     },
     'steps': [
       {