Update Download page (zh_tw).
Translate Ruby 2.2.0 release post (de)
Translate related ruby 2.2.0 (ko)
Merge pull request #933 from marocchino/ko-2-2-0

Translate related ruby 2.2.0 (ko)
Update 2014-12-25-ruby-2-2-0-released.md

Change the link to incremental gc document (presentation slide in English)
Sync install page with english (zh_tw).
Create 2014-12-26-mac-mini.md
Apply review changes on installation page (zh_tw).
Merge pull request #938 from stomar/de-release-2-0-0

Translate Ruby 2.2.0 release post (de)
Translate 2014-12-25-ruby-2-2-0-released [vi]
Merge pull request #943 from nhattan/translate-ruby-2-2-0

Translate 2014-12-25-ruby-2-2-0-released [vi]
Merge pull request #940 from ruby/zh_tw/download-and-associated-updates

Zh tw/download and associated updates
Translate 2014-12-18-ruby-2-2-0-rc1-released [vi]
Need a space on installation page (zh_tw).
Translated the news article about Ruby 2.2.2-rc1 (ru).
Merge pull request #939 from ko1/patch-1

Update 2014-12-25-ruby-2-2-0-released.md
Fix typo in 2.2.0 post (en)
Update 2.2.0 post (de)

Fix updated link (Incremental GC presentation); add missing translations.
Update downloads page for 2.2.0 (de)
Added a translation for latest news (ru).