CloudSigma2 ComputeService and SecurityGroupExtension

* Added the ComputeService implementation
* Added the SecurityGroup extension
* Added the San Jose region
> I don't get your comment. 

Sorry, my comment was indeed a bit short ;-) I had [commented above](https://github.com/jclouds/jclouds-labs/pull/70/files#r17825992) about some logic in `TemplateOptions` that modifies `options` (by calling `nameTask`) under certain conditions. I don't see a corresponding test for that behaviour.

I'm not saying we _need_ one, just wanted to point that out ;-)