Merge pull request #2 from rylwin/master

Avoid ArgumentError when clearing has_many or habtm using Mysql adapter

lib/acts_as_archive.rb

@@ -203,7 +203,7 @@ def self.included(base)
     end
 
     module InstanceMethods
-      def delete_with_archive(arel, name, binds=[])
+      def delete_with_archive(arel, name=nil, binds=[])
         @mutex ||= Mutex.new
         @mutex.synchronize do
           unless ActsAsArchive.disabled