Re-add YARD and the according Rake task
Remove Yardstick, configure Inch

Inch works now. It also has a Raketask to report it.
Re-add Reek and the according Rake task
Re-add Rubocop and the according Rake task
Re-add mutant and the according Rake task
Start a console with Ashikawa::Core loaded via rake console

http://erniemiller.org/2014/02/05/7-lines-every-gems-rakefile-should-have