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Add valueOf example

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	`1`	`+<!DOCTYPE html>`
	`2`	`+<html lang="en">`
	`3`	`+<head>`
	`4`	`+ <meta charset="utf-8">`
	`5`	`+ <title>valueOf Example</title>`
	`6`	`+ <link rel="stylesheet" href="http://code-warrior.github.io/styles/reset.css">`
	`7`	`+ <link rel="stylesheet" href="http://code-warrior.github.io/styles/base.css">`
	`8`	`+</head>`
	`9`	`+<body>`
	`10`	`+ <h1><code>valueOf</code> Example</h1>`
	`11`	`+ <p>Open your console to see this program’s output from the file <a href="valueOf.js">valueOf.js</a></p>`
	`12`	`+ <script src="valueOf.js"></script>`
	`13`	`+</body>`
	`14`	`+</html>`

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	`1`	`+/jslint es6, single, devel, this /`
	`2`	`+/eslint no-console: ["error", { allow: ["log"] }] /`
	`3`	`+`
	`4`	`+'use strict';`
	`5`	`+`
	`6`	`+// Construct the Dog object`
	`7`	`+function Dog(name, breed) {`
	`8`	`+ this.name = name;`
	`9`	`+ this.breed = breed;`
	`10`	`+}`
	`11`	`+`
	`12`	`+// Create a new Dog instance named dog`
	`13`	+let dog = new Dog(`Spot`, `mutt`);
	`14`	`+`
	`15`	`+// Retrieve the object itself`
	`16`	`+console.log(dog.valueOf()); // Dog {name: "Spot", breed: "mutt"}`
	`17`	`+`
	`18`	`+// Using prototypal inheritance, over-ride how valueOf behaves, returning the name`
	`19`	`+// of the dog`
	`20`	`+Dog.prototype.valueOf = function () {`
	`21`	`+ return this.name;`
	`22`	`+};`
	`23`	`+`
	`24`	`+console.log(dog.valueOf()); // Spot`

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