Merge remote-tracking branch 'xnat-web-custom-pages/master' into HEAD

src/main/webapp/WEB-INF/conf/xnat-security.xml

src/main/webapp/WEB-INF/tags/page/init.tag

src/main/webapp/WEB-INF/tags/page/xnat.tag

.../webapp/page/admin/data/config/site-admin-sample-new.yaml

src/main/webapp/page/admin/data/config/site-setup.yaml

src/main/webapp/page/admin/style.css

src/main/webapp/scripts/xnat/ui/panel.js

src/main/webapp/scripts/xnat/ui/templates.js

src/main/webapp/setup/index.jsp

src/main/webapp/xnat-templates/navigations/AppJS.vm

src/main/webapp/xnat-templates/navigations/DefaultTop.vm