Adds perl, php, python to the language parser. Refs #39

This follows the attributes that ohai outputs for the particular language.

See these for the ohai code:

- https://github.com/opscode/ohai/blob/master/lib/ohai/plugins/perl.rb
- https://github.com/opscode/ohai/blob/master/lib/ohai/plugins/php.rb
- https://github.com/opscode/ohai/blob/master/lib/ohai/plugins/python.rb

This is the direction I was hoping this would go. If accepted, I will add others - all the related non-node-specific details that ohai reports.