Fix Kryo Serializer buffer inconsistency

The documentation here is inconsistent with the coded default and other documentation.
TimeTrackingOutputStream should pass on calls to close() and flush().

Without this fix you get a huge number of open shuffles after running
shuffles.
Merge pull request #196 from pwendell/master

TimeTrackingOutputStream should pass on calls to close() and flush().

Without this fix you get a huge number of open files when running shuffles.
Merge pull request #193 from aoiwelle/patch-1

Fix Kryo Serializer buffer documentation inconsistency

The documentation here is inconsistent with the coded default and other documentation.