Puppet can be used on the basis of the ffrank-mgmtgraph module.
There are three modes available:
* fetching catalogs from the master (--puppet agent)
* compiling a manifest from a local file (--puppet /path/to/file.pp)
* compiling a manifest from the cli (--puppet "<manifest>")
Catalogs from the master are currently never refreshed. We should
add some more code to re-run the parsing function at an interval
equal to Puppet's local 'runinterval' setting.
There is also still a distinct lack of tests.
Still, this fixes#8
