fixes issue #41 since unicode kwargs is an feature of python 2.6.5 and above.
fixes issue #41 since unicode kwargs is an feature of python 2.6.5 and above.

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