Merge branch 'rpcfrontier' into develop

core/filter.go

event/filter/eth_filter.go

rpc/api.go

rpc/api_test.go

rpc/args.go

rpc/args_test.go

rpc/http.go

rpc/messages_test.go

rpc/responses.go

rpc/util.go

xeth/xeth.go