Improve class 1
Add class 7 exercises
Add ruby style guide for class 6
Tweak class 6 ruby style guide
Tweak class 6 ruby style guide
Tweak class 6 ruby style guide
Tweak class 5 and 6 ruby style guides
Tweak class 5 and 6 ruby style guides
Tweak class 5 and 6 ruby style guides
Tweak class 6 ruby style guide
Tweak class 6 ruby style guide
Tweak class 6 ruby style guide
Extract the ruby style guides (start)
Ignore changes to birth_dates.yml
Tweak class 7 exercises
pull upstream