Added a few improvements to delete_seen_shows.py.
Added a few improvements to delete_seen_shows.py.

- All logging goes to a file now
- Added `dryrun` flag that does not actually delete anything
- Other minor fixes (`autopep8`, typos, script description)

Original Gist:
https://gist.github.com/bernardomaciel/380af5e1cc235eb0103634f7e018a035

dawud/ansible-osmc,alombarte/raspberry-osmc-automated,alombarte/raspberry-osmc-automated,dawud/ansible-osmc