add partition deciding algorithm from old version
add partition deciding algorithm from old version

yungchin/pykafka,sontek/pykafka,wikimedia/operations-debs-python-pykafka,fortime/pykafka,benauthor/pykafka,appsoma/pykafka,jofusa/pykafka,vortec/pykafka,thedrow/samsa,aeroevan/pykafka,benauthor/pykafka,thedrow/samsa,aeroevan/pykafka,vortec/pykafka,sammerry/pykafka,tempbottle/pykafka,wikimedia/operations-debs-python-pykafka,tempbottle/pykafka,benauthor/pykafka,thedrow/samsa,sammerry/pykafka,fortime/pykafka,appsoma/pykafka,yungchin/pykafka,sontek/pykafka,wikimedia/operations-debs-python-pykafka,jofusa/pykafka