Enable twill importing in Downloader.py
Enable twill importing in Downloader.py

Former-commit-id: 0e908493bd74ce746ca96e2bc237f24c088a8f33
muslih/alfanous,muslih/alfanous,muslih/alfanous,muslih/alfanous,muslih/alfanous,muslih/alfanous,muslih/alfanous