ADD: translation draft for issue 14-0
Merge pull request #214 from johnnywjy/master

ADD: translation draft for issue 14-0
Fix a typo
Add missing code format
add issue 14 xpc translation, ready to review, :)
Update submodule
Merge pull request #215 from johnnywjy/master

Fix a typo and add missing code format
Reviewed
Merge branch 'master' of github.com:objccn/articles
publish 14-4
Prepare for gitbook
Finish 14-3's translation
fix a little mistake.
Merge pull request #217 from WilliamZang/patch-1

fix a little mistake.
Fix 6-1
Merge pull request #216 from oa414/issue-14-3-oa414

完成14-3翻译
Update submodule
finish issue-14-5 first draft
Merge branch 'new/issue-14-5-crazycatcher'
Create issue-14-1-ckitakishi.md