Colin Kaepernick's stock is skyrocketing in the National Football League and he's moving the needle on sales of San Francisco 49ers team jerseys and memorabilia as a result.Kaepernick, the 49ers' second-year quarterback who led the University of Nevada, Reno, football team to one of its best seasons ever in 2010, proved his mettle in the NFL with several big wins including a thrilling win over the New England Patriots in a nationally televised game barely more than a week ago.Sales of his No. 7 team jersey increased 4,000 percent since he was named a starter, says Josh Feinstein, director of …