1.http链接失败：
现象：
- “Permission denied (publickey).
- fatal the remote hang up unexpectly
原因：http链接失败
解决方法：
1）生成ssh密钥
2）然后将公钥拷贝到gitup配置之中。“Account Settings” > Click “SSH Public Keys” > Click “Add another public key”
3）修改本地配置
- edit .git/config file under your repo directory
- find url=entry under section [remote "origin"]
- change it from url=https://MichaelDrogalis@github.com/derekerdmann/lunch_call.git tourl=ssh://git@github.com/derekerdmann/lunch_call.git. that is, change all the texts before @ symbol to ssh://git
- Save config file and quit. now you could use git push origin master to sync your repo on GitHub
参考：http://stackoverflow.com/questions/7438313/pushing-to-git-returning-error-code-403-fatal-http-request-failed/9575906#9575906
