Double to single quotes.
Allow RedHat based distributions to choose `epel-testing` to bootstrap. Fixes #190.
Fix installation type checking.
Fix distributions testing packages support check.
Fix `test_install_testing` unit test. Logic was wrong.
Fixed issues address in comment.

Removed authors from header which will get it's own file.
Add an authors file.

Added @akoumjian, @alexvh, @plueschopath, @bruce-one, @cvrebert, @deployboy, @terminalmage, @geoffgarside, @jeffh, @ixela, @mguegan, @nevins-b, @aboe76, @s0undt3ch, @visualphoenix, @rca, @tateeskew, @thatch45, @kozhukalov and @whitmo to the authors file.
Make the rst table render properly.
A blank line is required.
Final table formatting fixes.
Typo. Thanks @cvrebert.
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
The develop branch is now v1.5.7-dev
Add the system packages upgrade fix/feature to the changes log.
Merge pull request #200 from s0undt3ch/develop

Bump dev version and update changes log