gitignore, added port option, tiny fixes

.gitignore

-client/pic
+conf.json

conf.json.example

 {
 	"slides": "slides",
-	"interval": 5000
+	"interval": 5000,
+	"port": 8080
 }

server.js

 
 function error(res, err) {
 	console.trace(err);
-	console.log(res.toString());
+	res.end(err.toString());
 }
 
 // The individual slide
 				.on("error", err => error(res, err))
 				.pipe(res);
 		} else {
-			console.log("loading "+parts.pathname+" from "+dir);
 			fs.createReadStream(pathlib.join(dir, parts.pathname))
 				.on("error", err => error(res, err))
 				.pipe(res);
 	var awaiters = [];
 
 	self.serve = function(req, res) {
-		console.log(currentSlide ? currentSlide.dir : "");
 		var parts = urllib.parse(req.url);
 
 		// /: Send the base site to the client
 
 http.createServer((req, res) => {
 	slideshow.serve(req, res);
-}).listen(8080);
+}).listen(conf.port);