Add tensorboard monitoring script

[ant0nsc]

• Script that starts tensorboard server on local box
• should pick up most recent run automatically, or accept a run_id argument
• See Word document for a link to examples from the chestXray project
• This script should be installed automatically in /bin when installing the package.
• Check with Mel if there are any extra gadgets that would be helpful here. For example: Should we not only store most_recent_run.txt, but a full submission history (most_recent_runs.txt), and tensorboard monitoring can then pick up the last 3, for example?