git uses alphanumerical codes to name the different versions of each codebase.

you can use github to look them up

http://github.com/username/repository/commit/alphanumerical-code
http://github.com/schwabsauce/railevant/commit/6daae03

or plug them into your own copy of the repos to investigate.

git checkout alphanumerical-code
git checkout 8534273