Add tests for challenge6
Add text file for challenge07
Adds challenge06 syllabus resource

Taken from https://gist.github.com/tqbf/3132752, it's
needed to run challenge 06
Bring challenge06 tests & solution back to life
map best-score-file with hex->bytes

best-score expects message to be bytes now, not hex values
Fix best-score test: Pass bytes, not hex
Merge pull request #4 from nberger/add-challenge6-to-refactoring-branch

Brings challenge6 tests and solutions back to life