API: Implement all get/post/put/delete methods.
Create forest: make sure data directories exist
MLNodeSshDriver: mount/unmount forest take volume support into account
Handful of tidies

* Util script in dist to start demo in GCE.
* Deleted unused class CompoundJcloudsLocationCustomizer
* Updated calls to deprecated Brooklyn methods
Split demo application into classes with and without volumes

start-gce.sh points at without volumes.