Fix warning on 1.8.7 about number of arguments given to change Listen's block.
Bump version to 2.6.0
Only clear the console once per run, instead of on each `execute` call.

Closes #25.
Greatly simplify command and output handling.

This removes the LogStatusHelper API, but afaik nobody used that.
Use sensible status defaults.
Return the status object after performing work.
Only clear the screen if any actual work is performed.

Closes #29.
Make Utils#perform_work available on Kernel.
Bump version to 2.6.1.

This removed some ondocumented API (LogStatusHelper), but I'm pretty sure
nobody was using that.