Fix long_image not being added with wide/tall_image

app/models/post.rb

@@ -461,9 +461,9 @@ class Post < ActiveRecord::Base
       end
 
       if image_width >= 1024 && image_width.to_f / image_height >= 4
-        tags << "wide_image"
+        tags << "wide_image long_image"
       elsif image_height >= 1024 && image_height.to_f / image_width >= 4
-        tags << "tall_image"
+        tags << "tall_image long_image"
       end
 
       return tags