[Contributions] Show bandwidth Savings Percentage in colse

[marcofbb]

This code shows you the percentage of bandwidth savings per browser console

/** Bandwidth Savings */
var downloaded_total = 0;
var downloaded = 0;
engine.on('piece_bytes_downloaded', function(method, bytes, peerId) {
	if(peerId){
		downloaded += bytes;
	}
	downloaded_total += bytes;
});
setInterval(function(){ console.log("Bandwidth Savings: " + ((downloaded*100)/downloaded_total) + "%"); }, 5000);

[hklcf]

It will be better to use Math.round round up the result