Google Doc很长时间无法使用，火了，GFW又把地址屏蔽了
修改hosts文件：
209.85.225.101 docs.google.com
74.125.127.100 writely.google.com
74.125.127.139 spreadsheets.google.com
209.85.147.109 pop.gmail.com
209.85.147.109 smtp.gmail.com
66.102.7.19 mail.google.com
209.85.225.101 docs.google.com
209.85.225.102 groups.google.com
74.125.127.100 services.google.com
74.125.127.100 sites.google.com
209.85.225.104 reader.google.com
74.125.127.101 calendar.google.com