Add an example to create/delete/list Google Cloud Storage buckets.

Remove all the `try...catch` in the individual methods and have one central try/catch in the main method? See e.g. [this example](https://github.com/jclouds/jclouds-examples/blob/master/rackspace/src/main/java/org/jclouds/examples/rackspace/cloudservers/CloudServersPublish.java)...