Note on 'ruby-install'

Added section about ruby-install.
Update Ruby-forum.org --> Ruby-forum.com and more (pt)
Fix small typo and Archives references (pt)
Fix Documentation Archives link (pt)
Add comp.lang.ruby Newsgroup line (pt)
Fix links to Ruby-PT group (pt)
Add note refering to lists.ruby-lang.org (pt)
Add emphasis on 'controller address' (pt)
Add alert about not using HTML e-mail (pt)
Fix small typo in _config.yml (pt)
Add languages_heading (pt)
Add credits to _config.yml (pt)
Add unmaintained notice in portuguese (pt)

It's more useful to have an unmaintained notice in portuguese than english.
Add pt/about/website/index.md (pt)
Add /pt/about/logo/ (pt)
Translate 2014-07-01-eol-for-1-8-7-and-1-9-2.md [vi]
Merge pull request #796 from ruby-vietnam/patch-9

Translate 2014-07-01-eol-for-1-8-7-and-1-9-2.md [vi]
Update semantic versioning #779 (ko)
Announce RubyKaigi 2014 Registration
Enable link to resoruces