Exposed the RKObjectRequestOperation in RKPaginator so that the developer has access to the request objects provided by the operation upon completion.
Set RKPaginator's objectRequestOperation to readonly as there is no need to set the operation for the class.
Merge branch '1332-rkpaginator-exposing-rkobjectrequestoperation' of github.com:maarek/RestKit into 1332-rkpaginator-exposing-rkobjectrequestoperation

Conflicts:
	Code/Network/RKPaginator.h
	Code/Network/RKPaginator.m