Log sprawl improvements

After adding the verbose logging features, this tool can generate ALOT of logs when doing a batch migration.

There a few things we could consider to make the logs a bit less overwhelming and more useful:
1. Include the name of the command in the log file name (e.g. timestamp.create-team.octoshift.log)
2. If running a generated script that includes many commands, combine all the logs together into 2 files (timestamp.octoshift.log + timestamp.octoshift.verbose.log)
3. Put the logs in a logs/timestamp/*.log directory

We may not need to do everything above, but we should at least do some of it.