Require config option to be enabled for debug logging.
Remove unneeded Config#logger=
Remove cruft
Always start Honeybadger in debug task.
..
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Don't modify string in place.
Standardize argument names for message
Fix spec
On second thought...
Suppress STDOUT when attached to terminal.
Use tty_level instead
Fix rails spec
Change default tty_level to DEBUG (always log by default)
Don't log shutdown

There's no point in logging this even on the debug level, since the
worker logs when it shuts down.
Move debug? to ConfigLogger
Return true rather than nil
Handle debug logs in #add