my $url = unicornify_url( email => $email, %options );
Constructs a URL to fetch the unicorn avatar for the given $email address.
%options are optional. unicornify_url will accept all the
options of gravatar_url in Gravatar::URL but as of this time only
size has any effect.
Specifies the desired width and height of the avatar (they are square)
As of this writing, valid values are from 32 to 128. The default is