This project is used in Clean Code E54 on cleancoders.com.
It plays the old logic game called "Master Mind".
The project uses Midje.
How to run the tests
lein midje will run all tests.
lein midje namespace.* will run only tests beginning with "namespace.".
lein midje :autotest will run all the tests indefinitely. It sets up a
watcher on the code files. If they change, only the relevant tests will be