Rethink http mojo life refresh

[abelsromero]

Current implementation injects the following at the end of the HTML.

<script>setTimeout(\"location.reload(true);\"," + autoReloadInterval + ");</script>

It works, but the full reload means the the page flickers and and the cursor is moved to the beggining.

I have a prototype solving these issues working with https://livejs.com/. But other options like https://livereload.com/ are also interesting.
The problem of the latest however, is that required a more complex protocol implementation, livejs only requires support for HEAD HTTP method.

[abelsromero]

A more serious WIP branch: https://github.com/abelsromero/asciidoctor-maven-plugin/tree/feature/468/complete-http-life-refresh.

Currently working with https://livejs.com/, there's obviously a delay due to polling. But is not that bad, and better than what we had before.