Add new 'last edited by' feature

Your app works great! Thanks to your app I actually learned that my app wasn't properly using the habtm relationship, my column names were incorrect on the join table which caused the entire relationship to not work!

I added a feature that I put in my app, just a 'last edited by' feature. I have a feeling that it could be refactored in some way but I am still a newb hehe.