Add Executor module for a centralized way to shell out
Use autoload
RENAME THE FILES OH YES
Merge branch 'last-modified-at-attr' of github.com:parkr/jekyll-last-modified-at into last-modified-at-attr

* 'last-modified-at-attr' of github.com:parkr/jekyll-last-modified-at:
  oh ruby subclassing... wat