Login dialog shows error for Safari with Private Window mode (#1172)

* #958 new StorageService service

abstraction around ‘Storage’ to allow switching to in-memory store
whenever ‘localStorage’ is not available (i.e. private/incognito modes,
etc.)

* fix unit tests

* update unit tests

- disable incorrect auth tests (core)
- simplify widget visibility tests (activiti-form)

* fix unit tests

ng2-components/ng2-alfresco-core/src/services/index.ts

@@ -15,6 +15,7 @@
  * limitations under the License.
  */
 
+export * from './storage.service';
 export * from './AlfrescoApi.service';
 export * from './AlfrescoSettings.service';
 export * from './AlfrescoTranslationLoader.service';