[About] Add controllers

Add initial implementations of controllers to support showing
the About dialog on logo click, WTD-667.

platform/commonUI/about/res/about-logo.html

@@ -1,2 +1,4 @@
-<mct-include ng-click="" key="'app-logo'">
-</mct-include>
+<span ng-controller="LogoController as logo">
+    <mct-include ng-click="show-about-dialog" key="'app-logo'">
+    </mct-include>
+</span>

platform/commonUI/about/src/AboutController.js

@@ -0,0 +1,21 @@
+/*global define*/
+
+define(
+    [],
+    function () {
+        "use strict";
+
+        function AboutController(versions, $window) {
+            return {
+                versions: function () {
+                    return versions;
+                },
+                openLicenses: function () {
+                    $window.open("#/licenses", "_blank");
+                }
+            };
+        }
+
+        return AboutController;
+    }
+);

platform/commonUI/about/src/LogoController.js

@@ -0,0 +1,18 @@
+/*global define*/
+
+define(
+    [],
+    function () {
+        "use strict";
+
+        function LogoController(overlayService) {
+            return {
+                showAboutDialog: function () {
+                    overlayService.createOverlay("overlay-about");
+                }
+            };
+        }
+
+        return LogoController;
+    }
+);