The San Francisco 49ers had two major goals to accomplish this offseason.They are halfway there.The 49ers signed quarterback Colin Kaepernick to a lucrative contract extension through the 2020 season on Wednesday. Kaepernick was entering the final year of his contract. Now, the 49ers have to complete their immediate task of securing a strong future by extending the contract of coach Jim Harbaugh.Harbaugh is entering the fourth year of a five-year contract that will pay him $25 million.