Implemented DigitalOcean Compute module

GoCloud PR#59: Implemented DigitalOcean Compute module

Basic Information

Pull Request: PR#59: Implemented DigitalOcean Compute module

Work

• Implemented DigitalOcean Compute module.
• Added test cases, examples and documentation for the same.

Functions implemented

• Createnode(): Createnode function creates a new droplet.
• Startnode(): Startnode function starts a droplet.
• Stopnode(): Stopnode function stops a droplet.
• Rebootnode(): Rebootnode function reboots a droplet.
• Deletenode(): Deletenode function deletes a droplet.