VM draft + cli setup (#20)

* updated readme

* added basic cmd.

* added seperate folders for cmd packages.

* Fix netmodes in test + reverse bigint bytes

* glide get deps

cli/server/server.go

@@ -0,0 +1,56 @@
+package server
+
+import (
+	"strings"
+
+	"github.com/CityOfZion/neo-go/pkg/network"
+	"github.com/urfave/cli"
+)
+
+// NewCommand creates a new Node command
+func NewCommand() cli.Command {
+	return cli.Command{
+		Name:   "node",
+		Usage:  "start a NEO node",
+		Action: startServer,
+		Flags: []cli.Flag{
+			cli.IntFlag{Name: "tcp"},
+			cli.IntFlag{Name: "rpc"},
+			cli.StringFlag{Name: "seed"},
+			cli.BoolFlag{Name: "privnet, p"},
+			cli.BoolFlag{Name: "mainnet, m"},
+			cli.BoolFlag{Name: "testnet, t"},
+		},
+	}
+}
+
+func startServer(ctx *cli.Context) error {
+	opts := network.StartOpts{
+		Seeds: parseSeeds(ctx.String("seed")),
+		TCP:   ctx.Int("tcp"),
+		RPC:   ctx.Int("rpc"),
+	}
+
+	net := network.ModePrivNet
+	if ctx.Bool("testnet") {
+		net = network.ModeTestNet
+	}
+	if ctx.Bool("mainnet") {
+		net = network.ModeMainNet
+	}
+
+	s := network.NewServer(net)
+	s.Start(opts)
+	return nil
+}
+
+func parseSeeds(s string) []string {
+	if len(s) == 0 {
+		return nil
+	}
+	seeds := strings.Split(s, ",")
+	if len(seeds) == 0 {
+		return nil
+	}
+	return seeds
+}