Small mistake: removed duplicate of 'server ='

Author: Daniel Kutik

example/server.js

@@ -1,5 +1,5 @@
 var app = require('express')();
-var server = server = require('http').createServer(app);
+var server = require('http').createServer(app);
 var webRTC = require('webrtc.io').listen(server);
 
 server.listen(8000);