Logging for console commands added

Hey there,

I appreciate this is a bit of a hack and not utilising airbrake as it is intended, however I have found it useful for logging issues in console commands that are run as background jobs (e.g. cron tasks / daemons).

I'll leave it up to you to decide whether or not it is something you wish to support in your bundle.

See Airbrake/CONSOLE_README.md for more info

Cheers
Tom