add hashing partitioner
add hashing partitioner

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