Submission of interview stories

No questions other than the yaml section generally as I was someone unfamiliar with yaml and ruby.

I left the tech_screen unanswered as I wasn't sure how you wanted to address it, but I can go through that quickly today if you wish. 

I have a few code samples that I can send. They're old, but I think you can get an idea from them about how I think about problems and how to solve them in code.

I was afraid asking for the data structure would give too much away : )  What type of data-structure is empty?