Update server response JSON structure to match JSON RPC 2.0 specification.
Update server response JSON structure to match JSON RPC 2.0 specification.

result and error members should be omitted if not applicable.

QianChenglong/rpc,somyaSjsu/rpc,ingresso-group/rpc,gorilla/rpc,Gorilla/rpc,Gorilla/rpc,QianChenglong/rpc,somyaSjsu/rpc,jackmanlabs/rpc,mediocregopher/rpc,Limard/rpcHttp,gorilla/rpc,mediocregopher/rpc,jacobxk/rpc,segmentio/gorilla-rpc,mediocregopher/rpc,ingresso-group/rpc,Limard/rpcHttp,jacobxk/rpc,Limard/rpc,segmentio/gorilla-rpc,jacobxk/rpc,somyaSjsu/rpc,Gorilla/rpc,jackmanlabs/rpc,QianChenglong/rpc,ingresso-group/rpc,Limard/rpcHttp,Limard/rpc,segmentio/gorilla-rpc,gorilla/rpc,jackmanlabs/rpc,Limard/rpc