Full Res photos from Flickr

At the moment it appears that the flickr downloader downloads only a "large" version of the files but it is often possible to download a higher res (original) copy of the image.

For example the files in this folder, http://www.flickr.com/photos/lukejohnson/sets/72157622361782148/ which become downloaded to `640 x 1024` instead of `1200 x 1920`
