Bump shadow_puppet version to 0.9.1
Merge pull request #213 from bryantraywick/bump-shadow_puppet-to-0.9.1

Bump shadow_puppet version to 0.9.1
Adds a config test beffore restarting apache.
Merge pull request #215 from railsmachine/kplawver-add-config-check-before-apache2-restart

Adds a config test before restarting apache.
Ensure posfix is installed before creating main.cf file.
Merge pull request #216 from bryantraywick/ensure-postfix-is-installed-before-creating-main.cf-file

Ensure posfix is installed before creating main.cf file.