经典方式发布一个rubygem (classic way to publish a rubygem ）

（ 如何写gem, 在这里 simplest gem guide here: how to create a gem   ） 

1. 写好你的gem (finish your gem ) 

2. gem build youku_video_utility.gemspec

(确认你的credential 文件是正确的-- 登录rubygems.org之后，查看profile )  (make sure your rubygem's credential file is there and mod is correct) 

3. gem push youku_video_utility-0.1.0.gem