def validate_stack!
      
      mockup_options = {}
      relativizer_options = {}
      run_relativizer = true
      if @extractor_options
        mockup_options = {:env => @extractor_options[:env]}
        relativizer_options = {:url_attributes => @extractor_options[:url_attributes]}
        run_relativizer = @extractor_options[:url_relativize]
      end
      
      unless @stack.find{|(processor, options)| processor.class == HtmlMockup::Release::Processors::Mockup }
        @stack.unshift([HtmlMockup::Release::Processors::UrlRelativizer.new, relativizer_options])        
        @stack.unshift([HtmlMockup::Release::Processors::Mockup.new, mockup_options])
      end
    end
def validate_stack!
      
      mockup_options = {}
      relativizer_options = {}
      run_relativizer = true
      if @extractor_options
        mockup_options = {:env => @extractor_options[:env]}
        relativizer_options = {:url_attributes => @extractor_options[:url_attributes]}
        run_relativizer = @extractor_options[:url_relativize]
      end
      
      unless @stack.find{|(processor, options)| processor.class == HtmlMockup::Release::Processors::Mockup }
        @stack.unshift([HtmlMockup::Release::Processors::UrlRelativizer.new, relativizer_options])        
        @stack.unshift([HtmlMockup::Release::Processors::Mockup.new, mockup_options])
      end
    end
Checks if deprecated extractor options have been set
 Checks if the mockup will be runned