Implement TLS server

$ ./minio --tls --cert <your_cert> --key <your_private_key>

This patchset also provides crypto/x509 - which is a wrapper package
to generate X509 certificates.

This is necessary to provide certificates later through management console

main.go

@@ -1,7 +1,41 @@
 package main
 
-import "github.com/minio-io/minio/pkg/server"
+import (
+	"os"
+
+	"github.com/codegangsta/cli"
+	"github.com/minio-io/minio/pkg/server"
+)
+
+func parseInput(c *cli.Context) {
+	tls := c.Bool("tls")
+	certFile := c.String("cert")
+	keyFile := c.String("key")
+	server.Start(":8080", tls, certFile, keyFile)
+}
 
 func main() {
-	server.Start()
+	app := cli.NewApp()
+	app.Name = "minio"
+	app.Usage = "Minio Server"
+	var flags = []cli.Flag{
+		cli.BoolFlag{
+			Name:  "tls",
+			Usage: "Enable tls",
+		},
+		cli.StringFlag{
+			Name:  "cert",
+			Value: "",
+			Usage: "cert file path",
+		},
+		cli.StringFlag{
+			Name:  "key",
+			Value: "",
+			Usage: "key file path",
+		},
+	}
+	app.Flags = flags
+	app.Action = parseInput
+	app.Author = "Minio"
+	app.Run(os.Args)
 }