Use the '--netrc' cmdline option or set the 'netrc' config option
to 'true' to enable the use of .netrc authentication data.
The 'machine' names for the .netrc info are the lowercase extractor
names (or categories): batoto, exhentai, nijie, pixiv, seiga.
- The file extension of the first image had been used for all further
images
- API responses can contain invalid characters, which cause the XML
parser to fail (http://seiga.nicovideo.jp/user/illust/26377934
contains several \x08 characters)
