Full restructure in accordance with

- pkg/{subsystem}/{package} style
  - modify Makefile to reflect the new style,
    consolidate various entries
  - add a dummy ``main.go`` at top level

cmd/crypto/.gitignore

@@ -1 +0,0 @@
-crypto

cmd/crypto/crypto-options.go

@@ -1,127 +0,0 @@
-/*
- * Mini Object Storage, (C) 2014 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 (
-	"fmt"
-	"log"
-	"os"
-
-	"github.com/codegangsta/cli"
-	"github.com/minio-io/minio/pkg/crypto/md5"
-	"github.com/minio-io/minio/pkg/crypto/sha1"
-	"github.com/minio-io/minio/pkg/crypto/sha256"
-	"github.com/minio-io/minio/pkg/crypto/sha512"
-)
-
-var Options = []cli.Command{
-	Md5sum,
-	Sha1sum,
-	// Sha1sumFast, // TODO
-	Sha256sum,
-	Sha512sum,
-}
-
-var Md5sum = cli.Command{
-	Name:  "md5sum",
-	Usage: "",
-	Description: `
-`,
-	Action: doMd5sum,
-}
-
-var Sha1sum = cli.Command{
-	Name:  "sha1sum",
-	Usage: "",
-	Description: `
-`,
-	Action: doSha1sum,
-}
-
-/* TODO
-var Sha1sumFast = cli.Command{
-	Name:  "sha1sum-fast",
-	Usage: "",
-	Description: `
-`,
-	Action: doSha1sumFast,
-}
-*/
-
-var Sha256sum = cli.Command{
-	Name:  "sha256sum",
-	Usage: "",
-	Description: `
-`,
-	Action: doSha256sum,
-}
-
-var Sha512sum = cli.Command{
-	Name:  "sha512sum",
-	Usage: "",
-	Description: `
-`,
-	Action: doSha512sum,
-}
-
-func doMd5sum(c *cli.Context) {
-	hash, err := md5.Sum(os.Stdin)
-	if err != nil {
-		log.Fatal(err)
-	}
-	fmt.Printf("%x", hash)
-}
-
-func doSha1sum(c *cli.Context) {
-	hash, err := sha1.Sum(os.Stdin)
-	if err != nil {
-		log.Fatal(err)
-	}
-	fmt.Printf("%x", hash)
-}
-
-/* TODO
-func doSha1sumFast(c *cli.Context) {
-	buffer, err := ioutil.ReadAll(os.Stdin)
-	if err != nil {
-		log.Fatal(err)
-	}
-	hash, err := sha1.Sha1(buffer)
-	if err != nil {
-		log.Fatal(err)
-	}
-	var bytesBuffer bytes.Buffer
-	binary.Write(&bytesBuffer, binary.LittleEndian, hash)
-	fmt.Printf("%x", bytesBuffer.Bytes())
-}
-*/
-
-func doSha256sum(c *cli.Context) {
-	hash, err := sha256.Sum(os.Stdin)
-	if err != nil {
-		log.Fatal(err)
-	}
-	fmt.Printf("%x", hash)
-}
-
-func doSha512sum(c *cli.Context) {
-	hash, err := sha512.Sum(os.Stdin)
-	if err != nil {
-		log.Fatal(err)
-	}
-	fmt.Printf("%x", hash)
-}

cmd/crypto/crypto.go

@@ -1,31 +0,0 @@
-/*
- * Mini Object Storage, (C) 2014 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 (
-	"os"
-
-	"github.com/codegangsta/cli"
-)
-
-func main() {
-	app := cli.NewApp()
-	app.Name = "crypto"
-	app.Usage = "calculate cryptosum on a given stream"
-	app.Commands = Options
-	app.Run(os.Args)
-}

cmd/crypto/crypto.md

@@ -1,33 +0,0 @@
-% MINIO(1) Minio Manual
-% Minio community
-% December 2014
-# NAME
-crypto - calculate crypto sum on a stream
-
-# SYNOPSIS
-
-# DESCRIPTION
-```sh
-NAME:
-   crypto - calculate cryptosum on a given stream
-
-USAGE:
-   crypto [global options] command [command options] [arguments...]
-
-VERSION:
-   0.0.0
-
-COMMANDS:
-   md5sum
-   sha1sum
-   sha256sum
-   sha512sum
-   help, h      Shows a list of commands or help for one command
-
-GLOBAL OPTIONS:
-   --help, -h           show help
-   --version, -v        print the version
-```
-# EXAMPLES
-
-# AUTHORS