message: Show logged-in user as tooltip on a user-icon
diff: <div class="container-fluid" ng-controller="NavbarController">
  <div class="navbar-header">
  <a href="#/"><img class="navbar-brand navbar-logo" src="/public/images/JuiceShop_Logo.png"></a>
  - <span class="navbar-brand" ng-bind="userEmail"></span>
  <a class="navbar-brand" href="#/"><span ng-bind="applicationName"></span> <small ng-bind="version"></small></a>
  + <span class="navbar-brand" ng-show="isLoggedIn()">
  + <i class="fa fa-user-circle fa-lg" uib-tooltip="{{userEmail}}" tooltip-placement="right"></i>
  + </span>
  </div>
  <ul class="nav navbar-nav navbar-right">
  <li class="dropdown" ng-show="!isLoggedIn()">
  