add a readWithParams on the AGPipe and remove the existing readWithFilter

on the AGPipe protocol, a readWithParams or similar will be defined, that will take an NSDictionary with the arguments. The method will be used on the underling paging mechanism to pass the needed params to the server.

Further the existing "readWithFilter" method will be removed, paging will be served by the existing "read", which we will return the NSArray category (AGPagedResult) with the results (paged or not).