Cloudtools

Reverted change to jar distribution mechanism

* Move away from Anaconda Python to default system Python in `init_notebook.py` script.
* Add `--pkgs` flag to cluster start script to allow users to specify Python packages to install on cluster start-up.

Overhaul of command-line argument parsing, increment to v1.1.

All functionality in cloudtools is accessed through the `cluster` module.

There are 5 commands within the `cluster` module:
- `cluster name start [optional-args]`
- `cluster name submit [optional-args]`
- `cluster name connect [optional-args]`
- `cluster name diagnose [optional-args]`
- `cluster name stop`

where `name` is the required, user-supplied name of the Dataproc cluster.