-(AlfrescoRequest *) retrieveActivityStreamForSite:(AlfrescoSite
        *)site completionBlock:(AlfrescoArrayCompletionBlock)completionBlock - retrieves
      all activities for the specified site.
    Parameters
- (AlfrescoSite *) site
 - The site whose activity stream will be returned.
 - (AlfrescoArrayCompletionBlock) completionBlock
 - The block that is called with the activity stream on completion of the operation. The completion block has the format typedef void (^AlfrescoArrayCompletionBlock)(NSArray *array, NSError *error).
 
Returns
(AlfrescoRequest *)
Example