Extract some code in packages

- This will help split stuff in smaller, better tested packages
- This moves some stuff like the traefik command to package `cmd`

Signed-off-by: Vincent Demeester <vincent@sbr.pm>

cmd/version.go

@@ -1,63 +0,0 @@
-package cmd
-
-import (
-	"fmt"
-	"io"
-	"os"
-	"runtime"
-	"text/template"
-
-	"github.com/containous/flaeg"
-	"github.com/containous/traefik/version"
-)
-
-var versionTemplate = `Version:      {{.Version}}
-Codename:     {{.Codename}}
-Go version:   {{.GoVersion}}
-Built:        {{.BuildTime}}
-OS/Arch:      {{.Os}}/{{.Arch}}`
-
-// NewVersionCmd builds a new Version command
-func NewVersionCmd() *flaeg.Command {
-
-	//version Command init
-	return &flaeg.Command{
-		Name:                  "version",
-		Description:           `Print version`,
-		Config:                struct{}{},
-		DefaultPointersConfig: struct{}{},
-		Run: func() error {
-			if err := getVersionPrint(os.Stdout); err != nil {
-				return err
-			}
-			fmt.Printf("\n")
-			return nil
-
-		},
-	}
-}
-
-func getVersionPrint(wr io.Writer) error {
-	tmpl, err := template.New("").Parse(versionTemplate)
-	if err != nil {
-		return err
-	}
-
-	v := struct {
-		Version   string
-		Codename  string
-		GoVersion string
-		BuildTime string
-		Os        string
-		Arch      string
-	}{
-		Version:   version.Version,
-		Codename:  version.Codename,
-		GoVersion: runtime.Version(),
-		BuildTime: version.BuildDate,
-		Os:        runtime.GOOS,
-		Arch:      runtime.GOARCH,
-	}
-
-	return tmpl.Execute(wr, v)
-}