Add support to beautify html through js-beautify

[m-mujica]

@justinbmeyer before I write any tests, wanted to run the idea by you....

generate(docMap, {
	html: {
		templates: "...",
		dependencies: {}
	},
	beautifyHtml: true,
	dest: "....",
	parent: "..."
});

With this change you could run the rendered html through js-beautify, you could either set the flag to true or pass an options object.

Not a game-changer feature, but I thought it was cool to write out some nice looking html :)

[leoj3n]

Not a bad idea 👍