Allow to multiple download much more than 11 torrents

[arestov]

code bellow will rise error

(node) warning: possible EventEmitter memory leak detected. 11 listeners added. Use emitter.setMaxListeners() to increase limit.
Trace
    at DHT.EventEmitter.addListener (events.js:160:15)
    at Discovery.setTorrent (C:\webtorent_test\node_modules\webtorrent\node_modules\torrent-discovery\index.js:57:19)
    at Torrent._onSwarmListening (C:\webtorent_test\node_modules\webtorrent\lib\torrent.js:181:18)
    at Swarm.g (events.js:180:16)
    at Swarm.EventEmitter.emit (events.js:95:17)
    at Pool._onlistening (C:\webtorent_test\node_modules\webtorrent\node_modules\bittorrent-swarm\index.js:136:11)
    at Server.g (events.js:180:16)
    at Server.EventEmitter.emit (events.js:92:17)
    at net.js:1055:10
    at process._tickCallback (node.js:415:13)

var WebTorrent = require('webtorrent');

var magnets = [
  ...
];
var client = new WebTorrent();
magnets.forEach(function(item) {
    client.add(item[1]);
});

[arestov]

I'm developing app to search and play music (with node-webkit).
It must download about 12 infoDictionaries in parallel, find mp3 file in infoDictionary for current and next song, and download them.

I'v done some poor integration with torrent-stream (there was no streaming in webtorrent at the summer). But torrent-stream are not supposed for multiple downloads at all (for example it creates new instance of dht for each torrent).

Since I like webtorrent more (it have chrome app support, it's easy to communicate with you) I've switch code to webtorrent, but It is still many problems, so I will make some issues and PRs :)

[feross]

This is not an error, but a warning. It's caused by adding more than 10 listeners for the same event.

If you're using node.js 0.11 or later, you can disable the warning across all modules by running this code:

var EventEmitter = require('events').EventEmitter
EventEmitter.defaultMaxListeners = 0

[feross]

I also manually disabled this warning for bittorrent-dht and webtorrent in node 0.10.

See webtorrent/bittorrent-dht@894ea22 and 5affbe3

The warnings are still enabled if you run webtorrent with debug logs enabled. See: https://github.com/feross/webtorrent#enable-debug-logs

[feross]

Released as 0.12.1.