Add error-message directive.

Improve UX for focus handling.

res/app/components/stf/common-ui/error-message/error-message-directive.js

@@ -0,0 +1,15 @@
+module.exports = function errorMessageDirective() {
+  return {
+    restrict: 'EA',
+    replace: true,
+    scope: {
+      message: '@'
+    },
+    template: require('./error-message.jade'),
+    link: function (scope, element, attrs) {
+      scope.closeMessage = function () {
+        scope.message = ''
+      }
+    }
+  }
+}