新手问题 taobao 镜像好像有问题啊！？！
allen@ubuntu:~$ gem source -a http://ruby.taobao.org Error fetching http://ruby.taobao.org: Errno::ECONNREFUSED: Connection refused - connect(2) (http://ruby.taobao.org/specs.4.8.gz)
allen@ubuntu:~$ gem source -a http://ruby.taobao.org Error fetching http://ruby.taobao.org: Errno::ECONNREFUSED: Connection refused - connect(2) (http://ruby.taobao.org/specs.4.8.gz)
