test case for #140

git-svn-id: http://protostuff.googlecode.com/svn/trunk@1592 3b38d51a-9144-11de-8ad7-8b2c2f1e2016
use default constructor for primary group

git-svn-id: http://protostuff.googlecode.com/svn/trunk@1593 3b38d51a-9144-11de-8ad7-8b2c2f1e2016
exclusion predicate

git-svn-id: http://protostuff.googlecode.com/svn/trunk@1594 3b38d51a-9144-11de-8ad7-8b2c2f1e2016