[ADF-491] Task Attachment List Component (#1877)

* Create a new component Task Attachment List
Improve the datatable to get the rows to show

* The component name should follow the guide style
Move the Content calls in a different service file
Show the attach file inside the viewer

* Change method name

* Datatable should get the path and show the icon

* Improve attachment component

* Improve datatable documentation

* Remove console.log

ng2-components/ng2-activiti-tasklist/index.ts

@@ -34,7 +34,8 @@ import {
     ActivitiPeople,
     ActivitiTaskHeader,
     ActivitiStartTaskButton,
-    ActivitiPeopleSearch
+    ActivitiPeopleSearch,
+    TaskAttachmentListComponent
 } from './src/components/index';
 
 export * from './src/components/index';
@@ -52,7 +53,8 @@ export const ACTIVITI_TASKLIST_DIRECTIVES: any[] = [
     ActivitiPeople,
     ActivitiTaskHeader,
     ActivitiStartTaskButton,
-    ActivitiPeopleSearch
+    ActivitiPeopleSearch,
+    TaskAttachmentListComponent
 ];
 
 export const ACTIVITI_TASKLIST_PROVIDERS: any[] = [