[doc] Add "Quick Start" for OS X.

 - Version supported: 10.8, 10.9, 10.10
 - Section including: "Setup", "Package Management", "Nginx"
 - Setup including: MacPorts, Bash 4.x, Python 3.4, DBus
[doc] minor fix
[doc] Add "Quick Start" for Bash 4.x.

 - Version supported: 4.x.
 - Section including: "Key Bindings", "Expansion", "IO Redirection", "File Testing Operator", "Text Processing", "Regular Expression".
[cookbook] Initial commit

 - Add "CookError" exception with unittest
[cookbook] Add API of shell()
[cookbook] Add API of shell_output()
[doc] minor fix
[cookbook] Add function annotation for shell() and shell_output()
[OSX] Initial commit