rename singleton_class to single_class and misc

was clashing with real ruby method name
also many superclass mismatch fixes
some misc

lib/ruby/class_statement.rb

@@ -71,7 +71,11 @@ module Ruby
     end
 
     def to_s(depth = 0)
-      at_depth(depth , "class #{name}" , @body.to_s(depth + 1) , "end")
+      at_depth(depth , "class #{name} #{super_s}\n#{@body.to_s(depth + 1)}\nend")
+    end
+    # deriviation if apropriate
+    def super_s
+      @super_class_name ? " < #{@super_class_name}" : ""
     end
   end
 end

lib/ruby/method_statement.rb

@@ -39,7 +39,7 @@ module Ruby
 
     def to_s(depth = 0)
       arg_str = @args.collect{|a| a.to_s}.join(', ')
-      at_depth(depth , "def #{name}(#{arg_str})" , @body.to_s(depth + 1) , "end")
+      at_depth(depth , "def #{name}(#{arg_str})\n #{@body.to_s(1)}\nend")
     end
 
   end