iOS 从git拷贝Xcode的snippets

do following things in terminal

1. check out the project using:    git clone gitAddress
2. cd the project path
3. create a file ./setup_snippets.sh，and execute it。

content of ./setup_snippets.sh ：

#! /bin/bash
mv ~/Library/Developer/Xcode/UserData/CodeSnippets ~/Library/Developer/Xcode/UserData/CodeSnippets.backup

# rm ~/Library/Developer/Xcode/UserData/CodeSnippets

SRC_HOME=`pwd`
ln -s ${SRC_HOME}/CodeSnippets ~/Library/Developer/Xcode/UserData/CodeSnippets
echo "done"