AFC East free-agency update

[Editor’s note: This free-agency update comes from a variety of online resources. It includes re-signings, new signings, losses, and remaining free agents. If we’ve missed any, let us know.] Buffalo Bills Signed: LB Brandon Spikes (Patriots); LB Keith Rivers (Giants); G Chris Williams (Rams); RB Anthony Dixon (49ers); CB Corey Graham (Ravens). Re-signed: K Dan…