Remove the "compress" post-processor for now

plugin/post-processor-compress/main.go

-package main
-
-import (
-	"github.com/mitchellh/packer/packer/plugin"
-	"github.com/mitchellh/packer/post-processor/compress"
-)
-
-func main() {
-	plugin.ServePostProcessor(new(compress.PostProcessor))
-}

post-processor/compress/post-processor.go

-// compress implements the packer.PostProcessor interface and adds a
-// post-processor for compressing output.
-package compress
-
-import (
-	"errors"
-	"github.com/mitchellh/mapstructure"
-	"github.com/mitchellh/packer/packer"
-)
-
-type Config struct {
-	Format string
-}
-
-type PostProcessor struct {
-	config Config
-}
-
-func (p *PostProcessor) Configure(raw interface{}) error {
-	if err := mapstructure.Decode(raw, &p.config); err != nil {
-		return err
-	}
-
-	if p.config.Format == "" {
-		p.config.Format = "tar.gz"
-	}
-
-	if p.config.Format != "tar.gz" {
-		return errors.New("only 'tar.gz' is a supported format right now")
-	}
-
-	return nil
-}
-
-func (p *PostProcessor) PostProcess(ui packer.Ui, artifact packer.Artifact) (packer.Artifact, error) {
-	ui.Say("We made it to here.")
-	return nil, nil
-}