[preetbhinder]

I'm one of the developers who worked on Libretto. A couple of things we could use help with if somebody wants to jump on this:

* Google Compute Engine support (Difficulty: moderate) https://github.com/apcera/libretto/issues/13

* Virtualbox headless (Difficulty: easy) https://github.com/apcera/libretto/issues/17

* vCloud Air support (Difficulty: moderate) https://github.com/apcera/libretto/issues/18

* More unit tests

Suggestions/comments/feedback are welcome!