Small bugfix,support for the SSH api functions, new droplet updates

Fix for $parameters warning if images() is called without a filter.
Addition of all the SSH key management functions.
Addition of the event API.

scrub_data also turned on by default now. This seems like a monstrous issue from DO's side that it's not always on but without it other clients can read your data at a later stage. I didn't allow for it to be unset because I see no point as you cannot predictably get back your section of the disk.

Tried to stick in line with your naming and coding style. We're using this for a new project at Snapt.