tether 0.2.0

Extremely simple bindings to an OS web view.
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<!doctype html>
<html>
<head>
    <meta charset="utf-8">
    <title>Loading binary files, such as WASM.</title>
</head>
<body>
<span id="answer">Determining the answer to life...</span>
<script>
// The Rust side will call main with the port number of the local server.
function main(port) {
    let imports = {
        imports: {
            alert: s => {
                document.getElementById('answer').textContent = 'Using the power of WASM, we have determined that the answer to life is ' + s + '.';
            }
        }
    };

    // This is the important part - use the URL `http://127.0.0.1:PORT` to access the local server.
    fetch('http://127.0.0.1:' + port + '/life.wasm')
        .then(res => res.arrayBuffer())
        .then(buf => WebAssembly.instantiate(buf, imports))
        .then(obj => obj.instance.exports.something());
}

// Tell the Rust side that the JavaScript side is ready to start.
window.tether('load');
</script>
</body>
</html>