Merge pull request #66 from MaxMEllon/develop

merge: develop -> master
Merge pull request #69 from MaxMEllon/develop

merge: develop -> master
Added Gitter badge
Update README.md
Merge pull request #70 from gitter-badger/gitter-badge

Add a Gitter chat badge to README.md
Update README.md
modify: ランキングテーブル追加, right-bar削除
Merge pull request #71 from MaxMEllon/fix-layout

merge: fix-layout -> develop