Functionality: Meets Expectations
I believe the command line interface is working correctly and the runner file produces the correct hashes.

Object Oriented Programming Meets Expectations
I have five classes and only 2 methods are longer than seven lines. No class is over 100 lines. Variable are well named.

Test Driven Development Meets Expectations
Every method is tested and simple cov is running at 100%. I developed tests and then wrote methods. At times I had to rewrite tests as methods evolved but testing was always done in tandom.

Version Control Meets Expectations
I have 16 pull requests and 56 commits. I tried to keep commits to single chunks of functionality.