Initial Library Assignment- Submission

I finished getting the tests to pass on friday, there is a lot I want to add and do to this, I wanted to do the extensions, But I spent my entire weekend working on the front end project. I am definitely less comfortable with the front end stuff. A couple of notes about what I did, I started from scratch which caused some pain as far as method names and planned functionality, sorry about that! I did some editing to tests but for the most part I didn't change more than method names in the tests. My approach to this a Borrower is responsible for checking out and checking back in books, and managing there own array of borrowed books. A Borrower#check_out method calls a corresponding Library method that would then manage a similar book method all dealing with their own properties. I want to have a Library method that Instantiates a Borrower and allows a hypothetical Person to now borrow from that library, this way a Person instance could be a Borrower at multiple libraries. I would like to add this and the other extentions later today or this week and request another pull if that is acceptable.