Added packaging for npm module 'commonmark'.

Published to npm.  Closes #21.  The 'stmd' package should be
deprecated.

js/.npmignore

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+commonmark.js
+*.tgz
+index.html

js/README.md

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+CommonMark
+==========
+
+CommonMark is a rationalized version of Markdown syntax,
+with a [spec][the spec] and BSD3-licensed reference
+implementations in C and JavaScript.
+
+For more information, see <http://commonmark.org>.
+
+To play with this library without installing it, see
+the live dingus at <http://spec.commonmark.org/dingus.html>.
+
+This package includes the commonmark library and a
+command-line executable, `commonmark`.
+
+Basic usage example:
+
+    var reader = new commonmark.DocParser();
+    var writer = new commonmark.HtmlRenderer();
+    var parsed = reader.parse("Hello *world*");
+    var result = writer.render(parsed);
+
+ [the spec]: http://spec.commonmark.org
+

js/package.json

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+{ "name": "commonmark",
+  "description": "a strongly specified, highly compatible variant of Markdown",
+  "dist-tags": { "latest": "0.9.0" },
+  "versions": "0.9.0",
+  "homepage": "http://commonmark.org",
+  "keywords":
+   [ "markdown",
+     "commonmark",
+     "md",
+     "stmd" ],
+  "repository":
+   { "type": "git",
+     "url": "https://github.com/jgm/CommonMark.git" },
+  "author": "John MacFarlane",
+  "bugs": { "url": "https://github.com/jgm/CommonMark/issues" },
+  "license": "BSD-3-Clause",
+  "version": "0.9.0",
+  "main": "./lib/index.js",
+  "bin": { "commonmark": "./bin/commonmark" },
+  "scripts": { "test": "node ./test.js" },
+  "directories": {
+      "lib": "./lib"
+  },
+  "engines": {
+      "node": "*"
+  }
+}