Merge pull request #196 from s0undt3ch/develop

Support epel-testing for RedHat based distributions.
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
Merge pull request #200 from s0undt3ch/develop

Bump dev version and update changes log
Fix unbound variable by creating a wrapper function for Gentoo's emerge. Fixes #201.
Update ChangeLog.
Merge pull request #202 from s0undt3ch/issues/201

Fix unbound variable by creating a wrapper function for Gentoo's emerge.
Install the correct PyYAML package on CentOS/RHEL 5.