Update index.md

Remove ruby-lang.org.cn/forum, Use ruby-china.org
Fix comma
Merge pull request #370 from huacnlee/patch-1

Link to Ruby China
Fix CVE-2013-4164 link in 2.1.0-preview2 released post (en).
Translate 2.1.0-preview2 is released (zh_tw).
remove space in middle of words (ja)
Translate 'Ruby 2.1.0-preview2 is released' (de)
Fix wrong versions from en in Heap Overflow post
Merge pull request #371 from takahashim/ja-remove-space

remove space in middle of words (ja)
Bind ontouchstart in menu:

iOS/Android has a 300ms lag for onclick events in case the user intended
to scroll. If we bind on ontouchstart in addition to onclick, the menu
will drop down instantly on iOS. Considering the size and position of
the menu icon it doesn't seem likely that a touch on the menu icon is
the start of a scroll gesture, so I don't think this will be confusing.
fix wrong filename
Merge pull request #373 from judofyr/touchstart-menu

Bind ontouchstart in menu:
Translate the release of Ruby 2.1.0-preview2 (es)
Fix minor typo in new about floating point parser issue (es)
Merge pull request #377 from EduardoBautista/master

Fix minor typo in new about floating point parser issue (es)
Merge pull request #376 from dabit/master

Translate the release of Ruby 2.1.0-preview2 (es)
Fix for typos on 'Heap overflow' news post (fr)

Add missing verb, remove a pleonasm and reword some sentences.
Merge pull request #378 from cveneziani/fr_heap_overflow_typos

Fix for typos on 'Heap overflow' news post (fr)
Translate 'Ruby 2.1.0 preview2' (fr)
Copyediting for 2013-11-22 news about ruby-2.1.0-preview2 (fr)

Signed-off-by: Jean-Denis Vauguet <jd@vauguet.fr>