def self.to_s(hash)
result = separator
result +="* Revision Changes \n"
result += separator
result += display_array("Files", hash[:changed_files], :fields=>[:to_str], :headers=>{:to_str=>'file'})
result += "\n"
result += display_array("Classes", hash[:changed_classes])
result += "\n"
result += display_array("Methods", hash[:changed_methods]) + "\n"
result += separator
result +="* Project Churn \n"
result += separator
result += "\n"
result += display_array("Files", hash[:changes])
result += "\n"
class_churn = collect_items(hash[:class_churn], 'klass')
result += display_array("Classes", class_churn)
result += "\n"
method_churn = collect_items(hash[:method_churn], 'method')
result += display_array("Methods", method_churn)
end