Remove not supported property from document list

Custom folder icons as material design icon names are not supported for
the time being and might be reintroduced later.

ng2-components/ng2-alfresco-documentlist/README.md

@@ -210,23 +210,6 @@ HTML attributes:
 For `date` column type the [DatePipe](https://angular.io/docs/ts/latest/api/common/DatePipe-class.html) formatting is used.
 For a full list of available `format` values please refer to [DatePipe](https://angular.io/docs/ts/latest/api/common/DatePipe-class.html) documentation.
 
-### Custom folder icon
-
-Document list element exposes `folder-icon` property that accepts a CSS class list value with
-[folder_open](https://design.google.com/icons/#ic_folder_open) by default.
-
-![Default folder icon](docs/assets/folder-icon-default.png)
-
-You can provide any list of classes in order to customize look and feel of the icon.
-Example below shows the use of [folder_special](https://design.google.com/icons/#ic_folder_special) icon instead of the default one:
-
-```html
-<alfresco-document-list folder-icon="folder_special" ...>
-</alfresco-document-list>
-```
-
-![Custom folder icon](docs/assets/folder-icon-custom.png)
-
 ### Actions
 
 Document List supports declarative actions for Documents and Folders.

ng2-components/ng2-alfresco-documentlist/src/components/document-list.ts

@@ -64,9 +64,6 @@ export class DocumentList implements OnInit, AfterViewChecked, AfterContentInit,
     @Input()
     breadcrumb: boolean = false;
 
-    @Input('folder-icon')
-    folderIcon: string;
-
     @Input()
     thumbnails: boolean = false;