It's working now.

Fixes include:
* It's working now. ;-)
* Added new commands:
  * ? returns a help via Serial
  * r sets every LED to a random color
  * t sets the whole strip to green
* Afte receiving the first command, the status LED changes for every received command.

include/main.h

@@ -5,8 +5,12 @@ void cmd_output();
 void cmd_clear();
 void cmd_version();
 void cmd_get_max();
+void cmd_random_color();
+void cmd_test();
+void cmd_help();
 void send_nack();
 void send_ack();
+void send(byte data);
 void status_led_on();
 void status_led_off();
 void status_led_toggle();