Merged HEAD (5.2) to 5.2.N (5.2.1)

126355 jkaabimofrad: Merged FILE-FOLDER-API (5.2.0) to HEAD (5.2)
      119311 jvonka: RA-388 / RA-638 : FileFolder API - optimise userInfo lookup for cm:creator & cm:modifier (especially when getting folder children)
      - also return userInfo for other in-built user props, eg. cm:owner, cm:lockOwner, cm:workingCopyOwner


git-svn-id: https://svn.alfresco.com/repos/alfresco-enterprise/alfresco/BRANCHES/DEV/5.2.N/root@126701 c4b6b30b-aa2e-2d43-bbcb-ca4b014f7261

source/java/org/alfresco/rest/api/model/UserInfo.java

@@ -19,12 +19,14 @@
 
 package org.alfresco.rest.api.model;
 
+import java.io.Serializable;
+
 /**
  * Representation of a user info
  *
  * @author janv
  */
-public class UserInfo
+public class UserInfo implements Serializable
 {
     private String userName;
     private String displayName;