ngrease 0.1.1 released

This release adds a few features:

New user expressions $:append-children, $:child-count and $:compose.

$:compose is the first expression in the default context written in ngrease itself instead of java.

The article->html language creates anchors for all headings, and the html->html-source language naturally supports them, too.

The introduction article contains an explanation of the "enable - ensure - enforce" principle of ngrease.