Use Ruby 2.1.3 in all environments
Merge pull request #864 from stomar/ruby-version-setting

Use Ruby 2.1.3 in all environments
Fix wrong date in news post filename
Fix wrong filename of news post (vi)
Small fixes in 2.0.0-p576 post; rewrap (vi)
Translate ConFoo posting (de)
Translate Ruby 2.2.0-preview1 release post (de)
Translate Ruby 2.0.0-p576 release post (de)
Correct Ruby version in news post (de)
Small fix in news post (en, de, fr)
Several small fixes in recent news posts (de)
Use named link reference
Remove mention of "old style" function declarations

Use the term "prototypes" or describe as "ANSI style declarations".
Small fixes on ruby-core page
Small changes on ruby-core page (en)
Update branches on ruby-core page (en)
Use site variables for svn branch names (en)
Remove trailing whitespace
Fix typo
Small fixes on community page (tr)

Fix link, typos, indentation; add language info to IRC channel link.