Creates nova-compute windows service and defines the depencencies

This patch adds a new defined resource to handle windows services
based on Python. It makes use of registry module to create the
service and additionals entries required for creating a service
running a python script.

The nova-compute service is created using this defined resource,
it also configures the folders and dependencies.
Changed where the requirements for nova-compute service are established
Creating python service with SC instead of registry::service
Merge pull request #20 from luisfdez/feature/nova-service-registration

Creates nova-compute windows service and defines the depencencies