-(AlfrescoRequest *) retrievePersonWithIdentifier:(NSString
        *)identifier completionBlock:(AlfrescoPersonCompletionBlock)completionBlock -
      retrieves a Person object representing the user with the specified user
      identifier.
    Parameters
- (NSString *) identifier
 - The user identifier of the person to retrieve.
 - (AlfrescoPersonCompletionBlock) completionBlock
 - The block that is called with the person object on completion of the operation. The completion block has the format typedef void (^AlfrescoPersonCompletionBlock)(AlfrescoPerson *person, NSError *error).
 
Returns
(AlfrescoRequest *)
Example