added blob support

git-svn-id: http://haxe.googlecode.com/svn/trunk@5923 f16182fa-f095-11de-8f43-4547254af6c6
wrong class, already in sys.db

git-svn-id: http://haxe.googlecode.com/svn/trunk@5924 f16182fa-f095-11de-8f43-4547254af6c6