Use test domain and ip in examples

[mirestrepo]

At the moment I am using jupyter.brown.edu and a random ip for testing, maybe it would be best to set up something specific for this purpose

[broestls]

My solution for this will be to use a random inspec<random-4-alpha-characters>.juypter.brown.edu with a non-resolvable IP (127.0.0.1). Works fine and doesn't risk stomping on something important. This solution is implemented in #10.