Version agnostic

Hi, and thank you for creating this plugin. It has become a necessity for me as core drush enable/disable tend to break more often when it comes to dependencies.

I'm wondering if you've thought of making this version agnostic. I use drush outside of any Drupal root and recently started including plugins into the drush/includes/ directory. It would be nice if drush_mm was version agnostic so we could use the same plugin across different version of Drupal in this scenario and would not require downloading different version for our installs.

If you have interest in this feature, I'm willing to do some work on it. Can you point me to some of the relevant places to get me started? It'll be my first dive into drush plugins.

Thanks