Update the way flags are used

options.go

@@ -1,6 +1,7 @@
 package gomicro
 
 import (
+	"github.com/micro/cli"
 	"github.com/micro/go-micro/broker"
 	"github.com/micro/go-micro/client"
 	"github.com/micro/go-micro/cmd"
@@ -95,6 +96,18 @@ func Version(v string) Option {
 	}
 }
 
+func Flags(flags ...cli.Flag) Option {
+	return func(o *Options) {
+		o.Cmd.App().Flags = append(o.Cmd.App().Flags, flags...)
+	}
+}
+
+func Action(a func(*cli.Context)) Option {
+	return func(o *Options) {
+		o.Cmd.App().Action = a
+	}
+}
+
 // Metadata associated with the service
 func Metadata(md map[string]string) Option {
 	return func(o *Options) {