Added NullStream class that automatically creates and delete the NullStreamBuffer, thus fixing a memory leak
Added NullStream class that automatically creates and delete the NullStreamBuffer, thus fixing a memory leak


git-svn-id: 23b6355f2bb369032457de4eb5f713ee134f73a8@8738 16af8721-9629-0410-8352-f15c8da7e697

joevandyk/osg,joevandyk/osg,joevandyk/osg,joevandyk/osg,joevandyk/osg