Remote Spawner class for JupyterHub to spawn IPython notebooks and a remote server and tunnel the port via SSH

Need to have passwordless SSH access to remote server, need to setup jupyterhub_config.py:

c.RemoteSpawner.server_url = "docker3" # or IP
c.RemoteSpawner.server_user = "zonca"

And needs the 8081 port of the local machine that runs jupyterhub to be forwarded to the remote server.

Currently in development, it sort of works.

See the qsub branch for a proof-of-concept integration with Torque.