WIP: DigitalOcean API version 2 module.

The DigitalOcean API version 2, entered public beta in june 2014. So it must be about time that Ansible gets support for it as well.

This is basically a copy of the existing DigitalOcean module, with modifications to adjust for the new API.

This PR is a work in progress. Any help and suggestions are highly appreciated :)
I would remove these version added since it is a new module, right?