Allow end users to view logs or error trace on crash

[tomarney]

When I came across a bug that made the app crash (#9), I had to clone the repo and debug the app myself to be able to report a useful issue, since no errors were reported, and no logs were available (I think?).

It would be great if (at least) the python Traceback output could be easily retrieved by the end user to report their bug, without needing python developer knowledge.

Perhaps the log (as output to the console when run from the command line) could be dumped in a text file in the same directory as the executable on any exception? This should also be documented in the README or usage instructions.