Add .gitignore
Add module to download thumbnails from Commons

This module allows to download file thumbnails given the image name,
using the module urllib2 to access the MediaWiki API thumb.php.

The entry method is download_file().
Add unittests for the commonsdownloader module

Add a unittest module to test the methods in the commonsdownloader module.
Add test for method clean_up_filename()
Add unit test for make_thumb_url()
Add unit test for make_thumbnail_name()
Add script to download files from Commons

This command line script interfaces with the commonsdownloader module.

It provides two ways to download files:
-give file names to the command line
-give a text file listing all the files to download
Add setup script