add efficient filesystem handling for guard
Revert "add efficient filesystem handling for guard"

This reverts commit 6ba615c5866021a30d6b2c50ae33044b180dd14b.
Merge branch 'official'
Merge branch 'official'
Merge branch 'official'
翻译了部分文档，请进一步完善
Merge remote-tracking branch 'richard-ma/master' into translation/en
Merge pull request #328 from saberma/translation/en

英文版本翻译
Merge pull request #338 from ebowsoft/feature/330-event-display-end

event display end. fix #330
it should return to event page after sign in. fixed #339
merge.
config exception recipients.
Fixed heroku error, Gemfile.lock is ignore, slim version don't match:

ActionView::Template::Error (Unexpected text indentation
  /app/app/views/layouts/application.html.slim, Line 14
      header#header
      ^
Revert "Fixed heroku error, Gemfile.lock is ignore, slim version don't match:"

This reverts commit cff75a3bfe036c6db8f1a619d7ed91831182855b.
Revert "Revert "Fixed heroku error, Gemfile.lock is ignore, slim version don't match:""

This reverts commit 9a855512e99f74b1adf3289f376a1755db1ad286.