Added event specifically for items saved but not published

I need to be able to perform a task when a user saves a page as a draft, but the ItemSaved and ItemSaving events only seem to fire when publishing. I added a new event named ItemSavedAsDraft to IContentPersister. I also had to remove the N2.IoC.Windsor2 project from the solution file since it seems like it's been replaced and removed, and I couldn't get the solution to build otherwise.

This is my first time poking this deep into the codebase, so I tried to do as little as possible to get it working. If anyone sees anything that should be done differently, or if there's a better way to get to the event I need, please let me know.