Fixes #19. Callback in mv method is optional

Author: richardgirges

lib/index.js

@@ -49,8 +49,6 @@ module.exports = function(options) {
               safeFileNameRegex = options.safeFileNames;
 
             filename = filename.replace(safeFileNameRegex, '');
-
-            console.log('filename yo', filename);
           }
 
           var newFile = {
@@ -63,10 +61,12 @@ module.exports = function(options) {
               fstream = fs.createWriteStream(path);
               streamifier.createReadStream(buf).pipe(fstream);
               fstream.on('error', function(error) {
-                callback(error);
+                if (callback)
+                  callback(error);
               });
               fstream.on('close', function() {
-                callback(null);
+                if (callback)
+                  callback(null);
               });
             }
           };