duritong-sysctl has compatibility issues with puppet 2.7

For now pin ourselves to 0.0.4
Bump version to 4.0.12
Merge pull request #331 from sdodson/v4_0_12

Bump version to 4.0.12
Merge pull request #329 from sdodson/sysctl004

duritong-sysctl has compatibility issues with puppet 2.7