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

Godeps/Godeps.json

@@ -5,6 +5,11 @@
 		"./..."
 	],
 	"Deps": [
+		{
+			"ImportPath": "github.com/codegangsta/cli",
+			"Comment": "1.2.0-42-gfbda1ce",
+			"Rev": "fbda1ce02d5dabcee952040e5f4025753b6c9ce0"
+		},
 		{
 			"ImportPath": "github.com/gorilla/context",
 			"Rev": "50c25fb3b2b3b3cc724e9b6ac75fb44b3bccd0da"