safesystem with stdout and exit code capturing
Relax dependency on Clamp.

This allows other gems using Clamp to be mixed into the same Gemfile
as fpm.
fix gnutar bailing out on Darwin as root group does not always exist
added --numeric-owner param if group is root on macos
Make debian control tarball use owner and group arguments.

Hardcoding --group=root in tar command breaks on OSX.

Fixes issue #429.
enable travis
Add support for setting build-depends on debian targets
Merge pull request #451 from torrancew/feature/deb_build_depends

Add support for setting build-depends on debian targets
Merge pull request #449 from mdub/relax_clamp_dependency

Relax dependency on Clamp.
Merge pull request #448 from hatt/unstable-ish

safesystem with stdout and exit code capturing
Merge pull request #450 from AudaxHealthInc/fpm_fix_macos

Make debian control tarball use owner and group arguments (gnutar fix)