Add support for puppet 3.5.0

In puppet 3.5.0 'find_template' can no longer deal with strings for
parameter environment.
Merge pull request #7 from mmz-srf/add-support-for-puppet-3.5.0

Add support for puppet 3.5.0
introduce puppet syntax hilighting

This works nicely on github, and doesn't break on the forge
Release 0.4.3