Update doc examples

[plroebuck]

Description

"docs/example/tests.html"

• Convert URLs to use current package releases
  • Tradeoff: minification vs. freshness

 <link rel="stylesheet" href="https://cdnjs.cloudflare.com/ajax/libs/mocha/4.0.1/mocha.min.css">
 <script src="https://cdnjs.cloudflare.com/ajax/libs/chai/4.1.2/chai.min.js"></script>
 <script src="https://cdnjs.cloudflare.com/ajax/libs/mocha/4.0.1/mocha.min.js"></script>

to

 <link rel="stylesheet" href="https://unpkg.com/mocha/mocha.css">
 <script src="https://unpkg.com/chai/chai.js"></script>
 <script src="https://unpkg.com/mocha/mocha.js"></script>

"docs/example/chai.js"

• Determine why this is here
• Remove from source control if no reason exists