refs #4620 removed some code that was only there for IE8

CHANGELOG.md

plugins/CoreHome/angularjs/ajax-form/ajax-form.controller.js

plugins/CoreHome/angularjs/common/services/piwik-api.js

...Home/angularjs/siteselector/siteselector-model.service.js

plugins/CoreHome/javascripts/popover.js

plugins/CoreUpdater/templates/layout.twig

plugins/ExamplePlugin/javascripts/plugin.js

plugins/Installation/templates/layout.twig

plugins/Login/stylesheets/login.less

plugins/Morpheus/javascripts/piwikHelper.js

plugins/Morpheus/stylesheets/base/mixins.less

plugins/Morpheus/stylesheets/general/_utils.less

plugins/Morpheus/templates/layout.twig

...MultiSites/angularjs/dashboard/dashboard-model.service.js

plugins/Overlay/client/client.js

...ngularjs/sites-manager/sites-manager-admin-sites-model.js

plugins/UsersManager/stylesheets/usersManager.less

plugins/Widgetize/templates/iframe.twig