Added admin-mode.

For now it shows/hides columns in the Device List and adds kicking behaviour.
Using $rootScope.adminMode for convenience.

res/app/components/stf/admin-mode/admin-mode-directive.js

@@ -0,0 +1,11 @@
+module.exports = function adminModeDirective($rootScope, SettingsService) {
+  return {
+    restrict: 'AE',
+    link: function (scope) {
+      SettingsService.bind($rootScope, {
+        target: 'adminMode',
+        defaultValue: false
+      })
+    }
+  }
+}