Add copy to clipboard git clone URL

I made copy git clone URL to clipboard by using ZeroClipboard(v1.1.7 MIT License).
http://zeroclipboard.github.io/ZeroClipboard/

Please confirm this request, when you have time.

NOTE : I think need to choice more nice icon...(I have no sense of design)
and if you know good way to find swf file URL(in the gitbucket.js), please advise me.