send and receive arrays of pixls.

preparation for possible batching later.

js/pixl/index.html

			pixl.ctx.fillRect(screen_pos.x, screen_pos.y, pixl.size, pixl.size);
			pixl.world[pos.x + "," + pos.y] = {};
			if (pixl.online) {
				pixl.ws.send(JSON.stringify({x: pos.x, y: pos.y, color: color || "black"}));
				pixl.ws.send(JSON.stringify([{x: pos.x, y: pos.y, color: color || "black"}]));
			}
		}

js/pixl/server.js

	socket.send(JSON.stringify(world));
	socket.on('message', function(msg) {
		var pixl = JSON.parse(msg);
		world[pixl.x + "," + pixl.y] = {color: pixl.color};
		console.log(pixl);
		var pixls = JSON.parse(msg);
		pixls.forEach(function(pixl) {
			world[pixl.x + "," + pixl.y] = {color: pixl.color};
			console.log(pixl);
		});
		server.clients.forEach(function(client) {
			if (socket != client) {