Remove class5 git_config
Remove class5 songs
Remove class5 target images
Remove class5 gitignore file
Improve class5 exercises
Fix typos
Fix typo
Merge branch 'master' of https://github.com/codefellows/sea-c21-ruby

Steph did a "git pull upstream master"
Solved Class 5 exercises 1, 2, 3, 4