修改host
185.31.17.184 github.global.ssl.fastly.net
207.97.227.239 http://github.com
65.74.177.129 http://www.github.com
207.97.227.252 http://nodeload.github.com
207.97.227.243 http://raw.github.com
204.232.175.78 http://documentcloud.github.com
204.232.175.78 http://pages.github.com
