Improved description of fetch with two arguments
Update README.md

add another case for use unless case. I saw in many places something like: 'if not current_user'. I think it's a bad way to do that.
Discourage the use of and/or

It's really not worth it
Use backticks for backslash to make more consistent
Merge pull request #172 from lee-dohm/code_backslash

Use backticks for backslash to make more consistent
Merge pull request #170 from dwbutler/master

Clarified usage of `fetch` with two arguments
Prefer first and last over [0] and [-1]
Extend percent literals section
Reworked wording
git ignore file
replace bad with 差 and replace good with 好
源代码排版
translate 'prefer ... to ...' to '倾向使用 ... 而不是 ...'
语法
命名
注释
类与模块，和异常
集合
正则表达式
translate 'prefer' to '倾向使用'