Improve class5 exercises
Fix typos
Fix typo
Add class5 exercise5
Improve branching and looping guides
Fix bug
Improve readability
Improve array and method guides
Fix typo
Add array definition styles
Fix typo
Add more array definition styles
Fix typo
Remove for style guide
Fix typo
Fix typo
Fix alignment of class4 exercise2
Merge branch 'master' of https://github.com/codefellows/sea-c21-ruby
HW class 5 exercise 1 and 2