Adding support for Literate Kal

Much like literate CoffeeScript, this allows you to write markdown
files with embedded code. No support for a documentation generator
yet (though docco may work with minor tweaking), but you can run
.litkal and .kal.md files or compile them to JavaScript. Markdown
content becomes comments.

gh-110
rewriting literate test case in literate kal

gh-110
update package.json to support literate kal in the npm scripts

gh-110