#1866: support nijigen-daiaru source redirection

* brings the user to the front/1st page of the doujin similar when viewing manga in pixiv

app/models/post.rb

@@ -340,6 +340,9 @@ class Post < ActiveRecord::Base
       when %r{\Ahttp://e-shuushuu.net/images/\d{4}-(?:\d{2}-){2}(\d+)}i
       "http://e-shuushuu.net/image/#{$1}"
       
+      when %r{\Ahttp://jpg\.nijigen-daiaru\.com/(\d+)}i
+      "http://nijigen-daiaru.com/book.php?idb=#{$1}"
+
       else
         source
       end