"websocket" must be treated in a case insensitive manner for upgrades
"websocket" must be treated in a case insensitive manner for upgrades

Fixed according to the websocket draft specs.

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