Fix variable names to be lowercase for future parser compatibility.
Update Geppetto .project to version 4.
Allow tracking of metadata.json.
Merge branch 'lowercase-variables' of https://github.com/invliD/puppet-snmp into invliD-lowercase-variables
Merge branch 'invliD-lowercase-variables' into develop
Expand Puppet versions tested in Travis-CI.
Fix lint indentation warnings.