Niners add Osgood

The 49ers are suddenly stockpiling special-teams standouts. A day after adding veteran safety/special-teamer Ray Ventrone, the Niners have signed receiver/special-teamer Kassim Osgood, per a source with knowledge of the transaction. After seven seasons with the Chargers, Osgood spent two with the Jaguars.  Last year, he played for the Lions. Despite periodically making noise about wanting…