Add option for asyncLimit to set number of files processed at the same time

Author: JeremyPlease

lib/transfer.js

@@ -213,8 +213,9 @@ function _nonParseFileName(fileName) {
  * @return {Promise}
  */
 function _processFiles(files, handler) {
+  var asyncLimit = config.asyncLimit || 5;
   return new Promise(function(resolve, reject) {
-    async.eachOfLimit(files, 5, function(file, index, callback) {
+    async.eachOfLimit(files, asyncLimit, function(file, index, callback) {
       process.stdout.write('Processing '+(index+1)+'/'+files.length+'\r');
       file.newFileName = _nonParseFileName(file.fileName);
       if (_shouldTransferFile(file)) {