Moved binary files load progress reporting to Loader.js. Added load progress reporting to demos with larger meshes.

To be used like this:

    var loader = new THREE.Loader( true );
    container.appendChild( loader.statusDomElement );

    loader.loadBinary( url, function( geometry ) { createScene( geometry ) }, path );

    function createScene( geometry ) {
        ...

        loader.statusDomElement.style.display = "none";

    }