JCloud ProfitBricks provider implementation

Hi! This implements most of ProfitBrick's API. I look forward for your comments, suggestions, and revisions.
Sure. You'll find both [here](https://github.com/jclouds/jclouds/blob/master/apis/cloudsigma/src/main/java/org/jclouds/cloudsigma/compute/CloudSigmaComputeServiceAdapter.java#L138-L162) and [here](https://github.com/jclouds/jclouds/blob/master/apis/elasticstack/src/main/java/org/jclouds/elasticstack/compute/ElasticStackComputeServiceAdapter.java#L143-L167).