disable http.Agent reuse since it seems to cause issues

lib/reader.js

@@ -49,7 +49,7 @@ function getFileStream(srcUrl, options, cb) {
     if (!headers['user-agent']) headers['user-agent'] = DEFAULT_AGENT;
     if (!headers['accept-encoding']) headers['accept-encoding'] = ['gzip','deflate'];
 
-    var req = (options.probe ? request.head : request.get)({url:url.format(srcUrl), stream:true, headers:headers});
+    var req = (options.probe ? request.head : request.get)({url:url.format(srcUrl), pool:false, headers:headers});
     req.on('error', cb);
     req.on('response', function (res) {
       if (res.statusCode !== 200) {