python 3.3 test fixes
python 3.3 test fixes

reallistic/mongoengine,DavidBord/mongoengine,jimmyshen/mongoengine,RussellLuo/mongoengine,ConsumerPhysics/mongoengine,Multiposting/mongoengine,WingGao/mongoengine,gmacon/mongoengine,yarneo/mongoengine,khallaghi/mongoengine,closeio/mongoengine,noirbizarre/mongoengine,cogniteev/mongoengine,ms5/mongoengine,nathanial/mongoengine,Davidrjx/mongoengine,MakerReduxCorp/mongoengine,MongoEngine/mongoengine,iandd0824/mongoengine,losintikfos/mongoengine,ProgressivePlanning/mongoengine,nicolascine/mongoengine,MakerReduxCorp/mongoengine,cogniteev/mongoengine,gavincabbage/mongoengine,sourcelair/mongoengine,muhammad-ammar/mongoengine,touilleMan/mongoengine,larsbutler/mongoengine,blaggacao/mongoengine,Davidrjx/mongoengine,starsirius/mongoengine,prijindal/mongoengine,Catstyle/mongoengine,eli-b/mongoengine,9nix00/mongoengine,elephanter/mongoengine,MRigal/mongoengine