Fixes slug_size when the slug_file has been set
replacing gzip with pigz to improve slugbuild time

pigz is a parallel implementation of gzip that takes advantage of multiple cpus and has reportedly improved slug building results as seen here:
http://www.paasmag.com/2014/02/11/git-push-heroku-master-now-40-faster/

Signed-off-by: Paulo Fagiani <pfagiani@gmail.com>
Merge pull request #10 from fagiani/pigz

replacing gzip with pigz to improve slugbuild time
Update CONTRIBUTING.md

Signed-off-by: Jonathan Rudenberg <jonathan@titanous.com>
Update MAINTAINERS

Signed-off-by: Jonathan Rudenberg <jonathan@titanous.com>
Merge pull request #8 from flynn/update-contributing

Update CONTRIBUTING.md
Merge pull request #5 from zimbatm/patch-1

Fixes slug_size when the slug_file has been set
Removed the flag to use gzip compression, since flynn now uses pigz.

Signed-off-by: Joe Dallago <jd.dallago@gmail.com>
Merge pull request #12 from jayd3e/master

Removed the flag to use gzip compression, since flynn now uses pigz.
Update Makefile

Signed-off-by: Jonathan Rudenberg <jonathan@titanous.com>
Update README.md
Add --quiet to git when cloning $BUILDPACK_URL

This fixes invalid gzip formatted output.

Signed-off-by: Iskandar Najmuddin <github@iskandar.co.uk>
Merge pull request #15 from iskandar/master

Add --quiet to git when cloning $BUILDPACK_URL