[JCLOUDS-702] JCloud ProfitBricks provider implementation

Hi! This implements most of ProfitBrick's API. I look forward for your comments, suggestions, and revisions.
So I created a ProviderMetadata and <a href="https://github.com/devcsrj/jclouds-labs/blob/round1/profitbricks/src/main/java/org/jclouds/profitbricks/ProfitBricksProviderMetadata.java#L24">annotated it with <code>AutoService</code></a> (removed it from <a href="https://github.com/devcsrj/jclouds-labs/blob/round1/profitbricks/src/main/java/org/jclouds/profitbricks/ProfitBricksApiMetadata.java#L32">ApiMetadata</a> as well). <a href="https://github.com/devcsrj/jclouds-labs/blob/round1/profitbricks/src/test/java/org/jclouds/profitbricks/ProfitBricksApiMetadataTest.java">This test</a> though is now throwing a <code>ServiceConfigurationError</code> telling me that <i>Provider ...ProfitBricksProviderMetadata not a subtype</i>. Am I missing something?