Allow acces to articles.json without a blog ID

lib/shopify_api/resources/article.rb

@@ -2,9 +2,14 @@ module ShopifyAPI
   class Article < Base
     include Events
     include Metafields
+    include DisablePrefixCheck
 
     self.prefix = "/admin/blogs/:blog_id/"
-    
+     
+    def self.prefix(options={})
+      options[:blog_id].nil? ? "/admin/" : "/admin/blogs/#{options[:blog_id]}/"
+    end
+
     def comments
       Comment.find(:all, :params => { :article_id => id })
     end