Add retry on getting pokemon

Summary

A few changes included with this MR:

Retry getting on pokemon

Turns out some of the pokemon chain numbers return 404s and I'm not sure why. Either way, just keep retrying until we hit a chain that does exist.

Update !find message to specify when no pokemon are caught

Logging changes

Instead of doing everything as info logs, let's change some more verbose logs to be debug and add a command line flag to enable or disable debug logging. This way, I can enable debug logging by editing the kubernetes spec directly.