pry/pry — comment on commit c97ecf0b258a0c8446d790724b3da0dab11e0efe
File:  line 0
By YorickPeterse:

Signing them off is a good practice, is basically means that you've reviewed
then and approve of them. They're somewhat less useful if you're only signing
them yourself but the end idea is that multiple people will sign them to show
who looked into the commit and thought it was a good idea.

More information on this can be found here: http://stackoverflow.com/questions/1962094/what-is-the-sign-off-feature-in-git-for