#1866: improved gelbooru support

* support for discontinued sha1 naming scheme
* all redirects to gelbooru will now use danbooru's md5 hashes
* update for aa7a91c98f

app/models/post.rb

@@ -336,8 +336,8 @@ class Post < ActiveRecord::Base
       when %r{\Ahttp://static[1-6]?\.minitokyo\.net/(?:downloads|view)/(?:\d{2}/){2}(\d+)}i
         "http://gallery.minitokyo.net/download/#{$1}"
 
-      when %r{\Ahttp://(?:(?:s?img|cdn|www)\d?\.)?gelbooru\.com/{1,2}(?:images|samples)/\d+/(?:sample_)?([a-f0-9]{32})\.}i
-        "http://gelbooru.com/index.php?page=post&s=list&md5=#{$1}"
+      when %r{\Ahttp://(?:(?:s?img|cdn|www)\d?\.)?gelbooru\.com/{1,2}(?:images|samples)/\d+/(?:sample_)?(?:[a-f0-9]{32}|[a-f0-9]{40})\.}i
+        "http://gelbooru.com/index.php?page=post&s=list&md5=#{md5}"
 
       when %r{\Ahttps?://(?:slot\d*\.)?im(?:g|ages)\d*\.wikia\.(?:nocookie\.net|com)/(?:_{2}cb\d{14}/)?([^/]+)(?:/[a-z]{2})?/images/(?:(?:thumb|archive)?/)?[a-f0-9]/[a-f0-9]{2}/(?:\d{14}(?:!|%21))?([^/]+)}i
         subdomain = $1