Add some test infrastructure

[JayH5]

See the commits for detailed information but this now does:

• Puppet (.pp file) lint checks
• Puppet syntax checks
• metadata.json lint checks
• Makes sure classes compile
• Cleans up a bunch of stuff
• Adds a "test" task that runs all syntax and spec tests
• Adds basic coverage tests (reporting 0% coverage)

[jerith]

:+1: