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

server_auth_test.go

@@ -0,0 +1,37 @@
+/*
+ * Minio Cloud Storage, (C) 2015 Minio, Inc.
+ *
+ * Licensed under the Apache License, Version 2.0 (the "License");
+ * you may not use this file except in compliance with the License.
+ * You may obtain a copy of the License at
+ *
+ *     http://www.apache.org/licenses/LICENSE-2.0
+ *
+ * Unless required by applicable law or agreed to in writing, software
+ * distributed under the License is distributed on an "AS IS" BASIS,
+ * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+ * See the License for the specific language governing permissions and
+ * limitations under the License.
+ */
+
+package main
+
+import . "gopkg.in/check.v1"
+
+type MySuite struct{}
+
+var _ = Suite(&MySuite{})
+
+func (s *MySuite) TestAuth(c *C) {
+	secretID, err := GenerateSecretAccessKey()
+	c.Assert(err, IsNil)
+
+	accessID, err := GenerateAccessKeyID()
+	c.Assert(err, IsNil)
+
+	c.Assert(len(secretID), Equals, MinioSecretID)
+	c.Assert(len(accessID), Equals, MinioAccessID)
+
+	c.Log(string(secretID))
+	c.Log(string(accessID))
+}