Added ability to have scalar return values instead of partially-populated Document instances.
Added ability to have scalar return values instead of partially-populated Document instances.

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