Add error-message directive.

Improve UX for focus handling.

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

@@ -0,0 +1,23 @@
+describe('errorMessage', function () {
+
+  beforeEach(angular.mock.module(require('./index').name))
+
+  var scope, compile
+
+  beforeEach(inject(function ($rootScope, $compile) {
+    scope = $rootScope.$new()
+    compile = $compile
+  }))
+
+  it('should ...', function () {
+
+    /*
+     To test your directive, you need to create some html that would use your directive,
+     send that through compile() then compare the results.
+
+     var element = compile('<div error-message name="name">hi</div>')(scope)
+     expect(element.text()).toBe('hello, world')
+     */
+
+  })
+})