如遇到：
“git clone Permission denied (publickey)”
Heroku主要参考：
https://devcenter.heroku.com/articles/git
Heroku 部署：
http://blog.sina.com.cn/s/blog_812973c30101242z.html
Heroku 比较 AWS：
http://www.chinacloud.cn/show.aspx?id=10736&cid=11
问题现象：
http://www.samundra.com.np/solved-heroku-permission-denied-publickey/1132
http://stackoverflow.com/questions/3481973/heroku-error-permission-denied-public-key
http://stackoverflow.com/questions/17626944/heroku-permission-denied-publickey-fatal-could-not-read-from-remote-reposito
尝试通过以下步骤：
https://groups.google.com/forum/#!topic/heroku/CZag__M-oMk
http://www.gmarwaha.com/blog/2011/05/18/heroku-trouble-with-windows-and-ssh-keys/
http://helenaenred.tumblr.com/post/9914281364/permission-denied-publickey-git
最终解决方案：
http://www.mixtune.net/heroku-permission-denied-publickey/
http://stackoverflow.com/questions/3591084/git-clone-heroku-ssh-permission-denied