JCloud ProfitBricks provider implementation

Hi! This implements most of ProfitBrick's API. I look forward for your comments, suggestions, and revisions.
There are several providers such as ElasticHosts or CloudSigma that don't have the concept of Hardware Profiles. Instead of returning just one could you do something similar to what those providers do? (At least until [JCLOUDS-482](https://issues.apache.org/jira/browse/JCLOUDS-482) is fixed).