updated refEmulate script to output the exit code from the ARM assembly emulation

refEmulate

@@ -84,6 +84,8 @@ files.each do |file_path|
     unless $options[:assemble_only] then
       puts "-- Emulation Output:" 
       puts json['emulator_out']
+      puts "---------------------------------------------------------------"
+      puts "The exit code is: #{exit_code}."
       puts ""
     end
   end