Add new private_networking parameter
Correct parameter errors in API
Correct destroy_image URL
Correct new_domain_record; add edit_domain_record

DigitalOcean API docs are inconsistant regarding the return object keys:
/add/ says 'domain_record' while /edit/ says 'record'. One is probably
 wrong.
Add show_event method
Added undocumented virtio parameter

As of May, it was supposedly added to the API docs (see
http://digitalocean.uservoice.com/forums/136585-digital-ocean/suggestions/3691393-add-virtio-support-to-your-api).
It's still a toggle when you create a droplet using DO's UI.
Merge pull request #2 from jdnier/api_updates

Api updates