[ADF-847] upgrade to use application configuration service (#1986)

* migrate core lib to use server-side app config

* fix unit tests

* update Search tests

- update tests
- upgrade tests to use TestBed

* update UserInfo tests

* update Social tests

* update tests

* update unit tests

* cleanup old code

* update about page

* update demo shell readme

* dev and prod configurations

demo-shell-ng2/config/webpack.common.js

@@ -102,7 +102,10 @@ module.exports = {
                 to: 'resources/i18n'
             },
             {
-                from: 'app.config.json'
+                from: 'app.config-dev.json'
+            },
+            {
+                from: 'app.config-prod.json'
             },
             {
                 from: 'favicon-96x96.png'