Enso command installation: a demo

My marvellous Enso command

This adds a "marvellous" command, which just prints a happy message of success.

Making your own commands installable

Add the following code to a page advertising one (or more) Enso commands:

<script src="http://localhost:31750/install.js"></script>

And then link to your Enso command(s) like this:

<a href="marvellous.py" rel="ensocommand">My marvellous Enso command</a>

That's it. There will be proper documentation for this later.