Add RHEL 7.
Install Perl dependencies on RHEL 7.
Add ubuntu 14.04.
RPM signing is now managed from Omnibus.
release v2.4.0
Add linting support (Foodcritic, Rubocop) to repo
Fix Rubocop style issues
Fix ChefSpec 4.1.x deprecation warnings
Use fully-qualified names when installing FreeBSD packages

This ensures the installs work correctly across all FreeBSD versions and
while using the various FreeBSD package providers (pkg, port and pkgng).