[compute] Add list_security_groups request
[compute] Add create_security_group request
[compute] Add list_security_groups_by_server request
[compute] Add get_security_group request
[compute] Add delete_security_group request
[compute] Add create_security_group_rule request
[compute] More tests for create_security_group_rule request
[compute] Add add_security_group request
[compute] Add remove_security_group request
[compute] Move security group requests to public

- create_security_group.rb
- create_security_group_rule.rb
- delete_security_group.rb
- get_security_group.rb
- list_security_groups.rb
- list_security_groups_by_server.rb
Merge pull request #8 from choodur/feature/AVIATORAPI-4

Feature/aviatorapi 4 - Security Group API