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)
Minor wording fix (ja)
translate examples (ko)
Merge pull request #794 from marocchino/ko-examples

Translate examples (ko)
Translate EOL for 1.8.7 and 1.9.2 (ko)
Translate ruby_from_other_languages (ko)