translate 2014-11-13-ruby-1-9-3-p551-is-released [vi]
Merge pull request #909 from ruby-vietnam/patch-193

translate 2014-11-13-ruby-1-9-3-p551-is-released [vi]
add vietnamese translation for 2-0-0-p598 release [vi]
Merge pull request #907 from tranvictor/vi-2-0-0-p598-is-released

add vietnamese translation for 2-0-0-p598 release
Fix news post titles in recent posts (vi)
Small fixes in recent posts (vi)
Improve installation page (en)

Provide a very short description of each of the
installation methods on the very top of the page.
Merge pull request #910 from stomar/installation-page

Improve installation page (en)