[JCLOUDS-702] JCloud ProfitBricks provider implementation

Hi! This implements most of ProfitBrick's API. I look forward for your comments, suggestions, and revisions.
As ProfitBricks is a provider, not only a generic API, you should add the ProviderMetadata too.
When it comes to implement the ComputeService abstraction, you can put there the default locations and other default properties for the provider, but the ProviderMetadata class should be added now.