Added options to set download buffer size and disable automatic buffer resizing.

README.md

@@ -17,6 +17,9 @@ which means you can modify it, redistribute it or use it however you like.
     -i, --ignore-errors      continue on download errors
     -r, --rate-limit LIMIT   download rate limit (e.g. 50k or 44.6m)
     -R, --retries RETRIES    number of retries (default is 10)
+    -b, --buffer-size SIZE   size of download buffer (e.g. 1024 or 16k) (default
+                             is 1024)
+    --no-resize-buffer       do not automatically adjust the buffer size
     --dump-user-agent        display the current browser identification
     --list-extractors        List all supported extractors and the URLs they
                              would handle