REST: Normalize content types accepted
REST: Normalize content types accepted

Same as content types provided, we accept the <<"application/json">> form.

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