[digitalocean|compute] tests updates
[digitalocean|compute] Added Servers collection tests
[digitalocean|compute] Implement missing requests

- power_off_server
- power_on_server
- shutdown_server

Added required tests
[digitalocean|compute] implemented missing Server actions

- shutdown
- stop
- start

Added required tests
[digitalocean|compute] string fixes
[digitalocean|compute] list_servers request test fixes
[digitalocean|compute] server model test fixes
[digitalocean|compute] remove extra comma, breaks ruby 1.8
[digitalocean|compute] Added support to use SSH keys when creating the server
[digitalocean|compute] added some more request

- create_ssh_key
- list_ssh_keys
[digitalocean|compute] Added list_flavors mock code
[digitalocean|compute] Added list_images mock code
[digitalocean|compute] added list_servers mock code
[digitalocean|compute] added list_regions mock code
[digitalocean|compute] initialize compute service mock data
[digitalocean|compute] added create_server mock code
[digitalocean|compute] added create_ssh_key mock code
[digitalocean|compute] added destroy_server mock code
[digitalocean|compute] added get_server_details mock code
[digitalocean|compute] list_servers uses mock data