Added "this" keyword to formal arguments of AssumePartitionedBy and  AssertPartitionedBy methods so that they function as extension methods.
Added "this" keyword to formal arguments of AssumePartitionedBy and  AssertPartitionedBy methods so that they function as extension methods.

xinhaoyuan/Naiad,xinhaoyuan/Naiad,ms705/Naiad,MicrosoftResearch/Naiad,TimelyDataflow/Naiad,TimelyDataflow/Naiad,MicrosoftResearch/Naiad,ms705/Naiad