0.2.1 - improved error messages and automated correct
adding hasObjectOperation()
Merge ASTQuery
Remove NullPointerException from With/Without Expression
memorization scheme
Merge pull request #17 from tetsurom/pegquery

Merge ASTQuery
Merge pull request #16 from tetsurom/fix_nullpo

Remove NullPointerException from With/Without Expression
rewrite scheme for flags
Merge branch 'master' of github.com:peg4d/peg4d-java
adding test/flag.p4d