delegate flush to session

git-svn-id: http://protostuff.googlecode.com/svn/trunk@1672 3b38d51a-9144-11de-8ad7-8b2c2f1e2016
remove method (ProtbufOutput dependency)

git-svn-id: http://protostuff.googlecode.com/svn/trunk@1673 3b38d51a-9144-11de-8ad7-8b2c2f1e2016
cleanup, remove unmaintained modules

git-svn-id: http://protostuff.googlecode.com/svn/trunk@1674 3b38d51a-9144-11de-8ad7-8b2c2f1e2016