Merge pull request #9 from TimothyYe/develop

Add content of Naming constants and Variables
Update README.md
Update README.md
add new content to 02/01
Add: Strings and characters
Update
初步完成 Using Swift with Cocoa and Objective-C 第三章
修复图片链接
complete Naming Constants and Printing Constants

complete Naming Constants and Variables and Printing Constants and
Variables
Merge pull request #10 from wh1100717/gh-pages

Strings and Characters 02/03
Merge pull request #12 from honghaoz/develop

complete Naming Constants and Printing Constants
Update README.md
Update README.md
Merge pull request #11 from haolloyin/translate

Translate
add article 02/03
Capitalised "Chinese"
merged
delete the error part
delete the error page
Merge pull request #13 from honghaoz/translate-swift

Capitalised "Chinese"