Completed homework questions

I've updated the readme inline with my answers for the first 2 questions.

The second two are subfolders within this project, with tests located in the TESTS folder.

I've added comments to explain things where I though appropriate. My models (for the second question) are just plain objects. I didn't make full on AR models for this because of the "no database" directive.

Hope to speak with you soon!
Thanks
Darin Higgins