Peer Review!

Hey, was just reviewing your app-a-day project.
* At first rake db:migrate wouldn't run so I cleaned up the migrations and removed an unnecessary one.
* After db:migrate worked, I removed index.html from public so your root route would work.
* Then I found one of your validations was not properly scoped, Steps were unique across the entire app, now they are just unique to your Task.
Try merging this pull request :+1: