Implement brush control on Arduino

[RaduMantu]

Implement a way for the Arduino to perform certain actions (e.g. lower brush, start rotating, etc) based on serial input. Two options, chose one:

• create a ROS node on Arduino and expose a service / listen to a topic (few issues with this)
• use termios in the NUC's ROS node that contains the main logic in order to send commands directly on the serial (circumvent the ROS messaging system)