Use namespace to build DBRef
Use namespace to build DBRef

refs #230

joune/jongo,edwardmlyte/jongo,edaubert/jongo,applango/jongo,joune/jongo,julienlavergne/jongo,ctrimble/jongo,ctrimble/jongo,bguerout/jongo,edaubert/jongo,shelsonjava/jongo,julienlavergne/jongo,applango/jongo,dgit-hub/jongo,dgit-hub/jongo,shelsonjava/jongo,edwardmlyte/jongo,bguerout/jongo