Merge pull request #1 from quad9/master

modified ruby_class.md
マージします。
add file 'ruby_file.md'
Merge branch 'master' of https://github.com/effe1/memo
modified ruby_file.md. add comments.
modified ruby_class.md
modified ruby_class.md and more.
modified ruby_class.md. merge commit.
modified ruby_class.md. add comments.