Remove the restriction on Processor ancestry.

lib/paperclip.rb

@@ -104,9 +104,6 @@ module Paperclip
       name = name.to_s.camelize
       load_processor(name) unless Paperclip.const_defined?(name)
       processor = Paperclip.const_get(name)
-      unless processor.ancestors.include?(Paperclip::Processor)
-        raise PaperclipError.new("Processor #{name} was not found")
-      end
       processor
     end
 

test/attachment_test.rb

@@ -447,6 +447,10 @@ class AttachmentTest < Test::Unit::TestCase
 
   context "An attachment with :processors that is a proc" do
     setup do
+      class Paperclip::Test < Paperclip::Processor; end
+      @file = StringIO.new("...")
+      Paperclip::Test.stubs(:make).returns(@file)
+
       rebuild_model :styles => { :normal => '' }, :processors => lambda { |a| [ :test ] }
       @attachment = Dummy.new.avatar
     end

test/paperclip_test.rb

@@ -25,10 +25,6 @@ class PaperclipTest < Test::Unit::TestCase
     end
   end
 
-  should "raise when sent #processor and the name of a class that exists but isn't a subclass of Processor" do
-    assert_raises(Paperclip::PaperclipError){ Paperclip.processor(:attachment) }
-  end
-
   should "raise when sent #processor and the name of a class that doesn't exist" do
     assert_raises(NameError){ Paperclip.processor(:boogey_man) }
   end