DocumentList component improvements

- expose ‘properties’ for the Node model
- Row filtering support for Document List (refs #522)
- Custom image resolver for Document List (refs #532)
- readme updates

ng2-components/ng2-alfresco-documentlist/src/models/document-library.model.ts

@@ -53,6 +53,7 @@ export class MinimalNodeEntryEntity {
     createdByUser: UserInfo;
     content: ContentInfo;
     path: PathInfoEntity;
+    properties: NodeProperties = {};
 }
 
 export class UserInfo {
@@ -77,3 +78,7 @@ export class PathElementEntity {
     id: string;
     name: string;
 }
+
+export interface NodeProperties {
+    [key: string]: any;
+}