Hide the Copy buttons in docs when Flash is not available

Created by: tarebyte

Hi There,

I'm opening up an issue before making a pull request to see if this was something that people might want. I would like to hide the the copy button for the code snippets when the browser doesn't support flash.

Here is a before and after:

I don't think it takes away from the design at all, and it would be really useful for people like me who use Firefox and don't have flash installed.

Thanks!