Now 10 years old, DXAgency in Edgewater, N.J. is starting to look pretty unusual. It's an independent creative advertising agency that's grown big enough to nab clients like the New York Knicks and Samsung, but hasn't been snapped up by one of the major holding companies. From across the Hudson River, the 50-person agency has evolved with the times from its single-industry roots to cover the waterfront in digital marketing. They specialize in running campaigns across digital media make consumers…