Merge pull request #1 from zertico/refactor_structure

Refactoring Structure. Defining Compute inside XenServer
Updating all references to fog organization
Changing Structure. Service should be inside the Compute namespace.
The request models need to be refactored yet. This changes affect only
the models.
Merge pull request #2 from fog/updating_links

Updating all references to fog organization
Merge pull request #3 from fog/reworking_structure

Changing Structure. Service should be inside the Compute namespace.