Full system upgrades are now optional on RH based distributions. Fixes #189.
Debian based distributions will now also run the upgrade procedures if desired.
RedHat based distributions backwards functionality broken! No system upgrades is now the default.
Fedora is now also able to upgrade the system before installing salt.
Merge pull request #199 from s0undt3ch/issues/189-system-upgrade

Full system upgrades are now optional on RH based distributions