Colorado slugger becomes first Rockies Hall of Famer By CHARLIE VASCELLARO • Special to www.AllOTSEGO.com Almost 30 years after the Colorado Rockies joined the major leagues as an expansion team in 1993, former Rockies outfielder Larry Walker is the first member of the franchise to be elected to the National Baseball Hall of Fame. Walker spent 10 of his 17 big-league seasons in a Colorado uniform and his plaque will be the first in the Hall of Fame gallery to…