first review
Merge remote-tracking branch 'upstream/master' into develop

* upstream/master: (37 commits)
  简单修正几处翻译
  玩家添加review
  review 高级操作符
  add review member
  Update 21_Protocols.md
  Update 21_Protocols.md
  Update README.md
  Update README.md
  认领review章节
  Update README.md
  Update README.md
  认领构造过程
  修改 review 目标为 语句
  change review name
  add review name
  Update README.md
  Update README.md
  Update 18_Type_Casting.md
  Update README.md
  Update 19_Nested_Types.md
  ...
type casting reviewed
完成
Merge pull request #78 from crazygx/master

type casting reviewed
Update 05_Control_Flow.md
Update 05_Control_Flow.md
Update 05_Control_Flow.md
加入英文对照
Merge branch 'master' of https://github.com/trans4fun/The-Swift-Programming-Language
格式调整
格式调整
Merge branch 'master' of https://github.com/trans4fun/The-Swift-Programming-Language

Conflicts:
	src/chapter2/05_Control_Flow.md
add pics
add java code style
no message
gitbook目录
review the basics
modify patterns by review
review basic