Add class 6 exercises
Fix class 6 exerise 3
Fix class 6 exerise 2
Improve assignments for class 6
Add executable bit to all class 6 exercises
Tweak class 6 exercise 4
Tweak to class 6 exercises
Tweak to class 6 exercise 5
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