Create an extension to execute JavaScript code in the browser

[ggrossetie]

This could be really useful when writing documentation for a JavaScript library.
The extension will search for JavaScript source code blocks and add a link/button "Run this code in your browser" to execute the code and print the result in the browser.

[mojavelinux]

This is something I've always envisioned being part of the source block. Perhaps we can add an "interactive" option to source block and use a Treeprocessor to add a "run this code" button and output area. That way, it wouldn't just be specific to JavaScript (though we could start there).

[mojavelinux]

Interesting to note that we might be able to support Ruby execution via Opal :)