The Colorado Avalanche have demoted winger Andreas Martinsen in order to make room on the 23 man roster for forward Shawn Matthias, acquired from the Toronto Maple Leafs on Sunday afternoon. After signing the 25 year old rookie from Duesseldorf EG in the DEL last summer, the Avalanche started Martinsen with a brief stint in the AHL. After nine games in San Antonio, Martinsen…