[Toolbar] set selection initially in fixed controller and toolbar... (#1994)

* [Toolbar] set selection initially in fixed controller and toolbar...

... to make the add button appear in the toolbar when a fixed position is created.

Remove selection change listener on destroy.

Start a digest cycle when handling selection in toolbar to avoid delays in toolbar.

Fixes #1991, #1987

* fixed checkstyle and lint errors

* Fix tests

* Update comment

platform/commonUI/edit/test/representers/EditToolbarRepresenterSpec.js

@@ -36,7 +36,7 @@ define(
             beforeEach(function () {
                 mockScope = jasmine.createSpyObj(
                     '$scope',
-                    ['$on', '$watch', '$watchCollection', "commit"]
+                    ['$on', '$watch', '$watchCollection', "commit", "$apply"]
                 );
                 mockElement = {};
                 testAttrs = { toolbar: 'testToolbar' };