-(AlfrescoRequest *)
        retrieveSitesWithListingContext:(AlfrescoListingContext *)listingContext
        completionBlock:(AlfrescoPagingResultCompletionBlock)completionBlock - retrieves a
      paged list of all sites in the repository that the current user has explicit membership
      of.
    Parameters
- (AlfrescoListingContext *) listingContext
 - The listing context with a paging definition that is used to retrieve the sites.
 - (AlfrescoPagingResultCompletionBlock) completionBlock
 - The block that is called with the sites on completion of the operation. The block has the format typedef void (^AlfrescoPagingResultCompletionBlock)(AlfrescoPagingResult *pagingResult, NSError *error);.
 
Returns
(AlfrescoRequest *)
Example