WASHINGTON The graffiti artist known as Borf has been busted.The Washington Post reports 'Borf' was arrested by D-C police yesterday. Police identify 'Borf' as an 18-year-old art student from Great Falls named John Tsombikos (zomm-BEE'-kohs).He and two other young men were arrested early yesterday after police got a tip that graffiti artists were spray painting in Northwest Washington.Some of the graffiti 'Borf' is believed responsible for includes a five-foot-high face that appears on a Roosevelt Bridge sign and a 15-foot Borf above a Dupont Circle cafe.Tsombikos' mother says 'Borf' was the nickname of a close friend of her son's who...