layouts_and_rendering.md 번역
active_record_querying.md 번역
Merge branch 'master' of https://github.com/RORLabGuides/docrails
Translating layouts_and_rendering.md

- redirect_to, header 메소드 번역
오타수정
Merge pull request #42 from seapy/master

기존 번역분입니다.