Tugboat rename droplet command

[petems]

Add tugboat rename command

From the API:

Rename Droplet
This method renames the droplet to the specified name.

Request URL:
https://api.digitalocean.com/droplets/[droplet_id]/rename/?client_id=[your_client_id]&api_key=[your_api_key]&name=[name]
Parameters
droplet_id Required, Numeric, this is the id of your droplet that you want to rename
name Required, String, new name of the droplet
Sample Response
{
  "status": "OK",
  "event_id": 7504
}