Missing "retro" default option from Gravatar
|Reported by:||beaulebens||Owned by:|
Although it's easy enough to add this via the 'avatar_defaults' filter, for completeness it probably makes sense to include the "retro" default for Gravatar as well (new addition).
As documented here: http://en.gravatar.com/site/implement/images/#default-image
Attached patch just adds it to the list of default options.