First time mode for controller

- Upon first time invocation ``minio controller`` would create access keys and secret id
- Upon request passing 'keys' arg ``minio controller`` would provide the keys
- Add colorized notification

vendor.json

@@ -44,6 +44,13 @@
 			"revision": "31fb71caf5a4f04c9f8bb3fa8e7c2597ba6eb50a",
 			"revisionTime": "2015-06-12T18:29:15Z"
 		},
+		{
+			"canonical": "github.com/fatih/color",
+			"comment": "",
+			"local": "vendor/github.com/fatih/color",
+			"revision": "76d423163af754ff6423d2d9be0057fbf03c57c2",
+			"revisionTime": "2015-08-24T00:44:34+03:00"
+		},
 		{
 			"canonical": "github.com/fatih/structs",
 			"comment": "",
@@ -79,6 +86,13 @@
 			"revision": "74aa4b5cceca1188df2c7128f7ede4c92893701e",
 			"revisionTime": "2015-08-09T21:43:58-07:00"
 		},
+		{
+			"canonical": "github.com/mattn/go-isatty",
+			"comment": "",
+			"local": "vendor/github.com/mattn/go-isatty",
+			"revision": "7fcbc72f853b92b5720db4a6b8482be612daef24",
+			"revisionTime": "2015-08-14T09:26:29+09:00"
+		},
 		{
 			"canonical": "github.com/minio/cli",
 			"comment": "",
@@ -100,6 +114,13 @@
 			"revision": "eb527c8097e0f19a3ff7b253a3fe70545070f420",
 			"revisionTime": "2015-08-29T22:34:20-07:00"
 		},
+		{
+			"canonical": "github.com/shiena/ansicolor",
+			"comment": "",
+			"local": "vendor/github.com/shiena/ansicolor",
+			"revision": "a5e2b567a4dd6cc74545b8a4f27c9d63b9e7735b",
+			"revisionTime": "2015-07-19T16:15:31+09:00"
+		},
 		{
 			"canonical": "github.com/weekface/mgorus",
 			"comment": "",