Do not remove duplicated Set-Cookie entries
Do not remove duplicated Set-Cookie entries

This commit closes #195, closes #199, closes #246.

yangchengjian/cowboy,imdeps/cowboy,unisontech/cowboy,LineMetrics/cowboy,callsign-core/cowboy_hybi00,276361270/cowboy,nviennot/cowboy,callsign-core/cowboy_hybi00,bsmr-erlang/cowboy,lpgauth/cowboy,turtleDeng/cowboy,K2InformaticsGmbH/cowboy,heroku/cowboy,rbalint/pkg-erlang-cowboy,piboye/cowboy,lpgauth/cowboy,layerhq/cowboy,grahamrhay/cowboy,ninenines/cowboy,unisontech/cowboy,LineMetrics/cowboy,piboye/cowboy,CrankWheel/cowboy,cad627/cowboy,odo/cowboy,ferd/cowboyku,Reimerei/cowboy,binarin/cowboy,MSch/cowboy,rabbitmq/cowboy,bobos/ecweb,manastech/cowboy,manastech/cowboy,paulperegud/cowboy,essen/cowboy,LineMetrics/cowboy,heroku/cowboy,hairyhum/cowboy,linearregression/cowboyku,heroku/cowboyku,cad627/cowboy,acrispin/cowboy,venkateshreddy/cowboy,pap/cowboy,yangchengjian/cowboy,essen/cowboy,omusico/cowboy,kivra/cowboy,dangjun625/cowboy,noname007/cowboy,layerhq/cowboy,sile/cowboy,binarin/cowboy