Merge pull request #664 from GRoguelon/master

Translate in french of the news about Ruby 2.1.1.
[en,ja]Add regression-of-hash-reject-in-ruby-2-1-1

Closes #665
[en][ja] Mention regression of Hash#reject

ref #665
Merge pull request #666 from sorah/ruby210-hash-reject-regression

[en,ja]Add regression-of-hash-reject-in-ruby-2-1-1
Fix links
Fix typos, links, markdown style in posts; rewrap
Fix link on downloads page (id, pt, zh_cn)
Translate 'Regression of Hash#reject in Ruby 2.1.1' (de)
Small fixes in Hash#reject news post (de)
Update 2.1.1 announcement with Hash#reject link (de)