Fixes a render bug that was causing self closing tags to have a closing tag. Very grateful to kthy for picking this up.
Also adds a new feature boolean attributes.
i.e.
https://github.com/byteface/domonic/issues/40
s = script(_src="foo.js", _async="")
<script src="foo.js" async></script>
there's a new undocumented package called templates with a status_page template for when prototyping.