Fix podman save when redirecting output

podman save would write the progress bar to the image tar file
when the output was redirected with >.
Fixed the writer to write to stderr for all commands using writer

Signed-off-by: umohnani8 <umohnani@redhat.com>

Closes: #362
Approved by: mheon

cmd/podman/create.go

@@ -392,7 +392,7 @@ func imageData(c *cli.Context, runtime *libpod.Runtime, image string) (string, s
 		// Pull the image
 		var writer io.Writer
 		if !c.Bool("quiet") {
-			writer = os.Stdout
+			writer = os.Stderr
 		}
 		createImage.Pull(writer)
 	}