Factor out plugin running into the Plugin module (along with the includers() handling).
-rw-r--r-- 405 Rakefile
drwxr-xr-x - bin
drwxr-xr-x - doc
drwxr-xr-x - lib
-rw-r--r-- 753 mailshears.example.conf.yml
-rw-r--r-- 740 mailshears.gemspec
drwxr-xr-x - test