Added Django 1.6 to travis Refs: #480, #454
Added Django 1.6 to travis Refs: #480, #454

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