Flags for these countries listed in ISO 3166 are currently missing:

ax - ÅLAND ISLANDS
cy - CYPRUS
gg - GUERNSEY
gs - SOUTH GEORGIA AND THE SOUTH SANDWICH ISLANDS
im - ISLE OF MAN
je - JERSEY
np - NEPAL

The other files in this folder are flags for codes that does not exit in
ISO 3166. Need investigation if they are only misnamed or what they actually
symbolize.

Updates:

- "yu" is Yugoslavia, which no longer exists as a country, see the Wikipedia
  article for more info: http://en.wikipedia.org/wiki/Yugoslavia
  The flag is kept around for historical purposes.