Add issue-5-2
Fix some bugs and add an Easter egg
Fix some bugs & Add source links.
vi+issue 8 first commit,
finish issue-3-2-answer-huang
Fix.
Merge pull request #61 from objccn/issue-5-2-fangyixiong

Add issue-5-2-morisunshine
Fix image link. Fix title and issue link
Merge pull request #63 from objccn/issue-3-2-answer-huang

finish issue-3-2-answer-huang
Add origin links.
Merge pull request #64 from JeOam/master

 翻译了第七期 卷首语
Update text in reference
Publish 5-2
Merge branch 'master' of github.com:objccn/articles
Fix a brace error
Publish 5-1. Fix image links
Fix link error
Fix less than
publish 7-0