Fetch all of rails' changelogs

fetch-rails-changelog.sh

for COMPONENT in actionmailer actionpack actionview activemodel activerecord activesupport; do
  for VERSION in master 4-2-stable 4-1-stable 4-0-stable 3-2-stable 3-1-stable 3-0-stable; do
    if [[ "$VERSION" == "3-0-stable" ]]; then
       FN='CHANGELOG'
    else
       FN='CHANGELOG.md'
    fi

    curl "https://raw.githubusercontent.com/rails/rails/${VERSION}/${COMPONENT}/${FN}" > ${COMPONENT}-${VERSION}-CHANGELOG
  done
done

actionview docs don't exist prior to 4.1, but otherwise this works up to 4.2+. This will need to be updated as new stables are released beyond 4.2.