compilerflasher_new is undocumented, and broken for third-party users

[Arachnid]

Thanks for contributing this in a way other people can use!

Unfortunately, with the introduction of compilerflasher_new, this no longer works, at least in Chrome. Trying to change old calls to use compilerflasher_new results in sites trying to load /js/codebender/chrome-client.js from their own domains, because of the use of a site-relative URL in compilerflasher_new:1910

Is there any chance you could fix this, and maybe document usage of the updated plugin as well?

[Arachnid]

It's worth noting that this also breaks your own blockly.codebender.cc.