-(AlfrescoRequest *)
        retrieveActivityStreamWithCompletionBlock:(AlfrescoArrayCompletionBlock)completionBlock
      - retrieves all activities for the currently authenticated user.
    Parameters
- (AlfrescoArrayCompletionBlock) completionBlock
 - The completion block called on completion of the operation. The completion block has the format typedef void (^AlfrescoArrayCompletionBlock)(NSArray *array, NSError *error).
 
Returns
(AlfrescoRequest *)
Example