(Reuters) - Four Somali immigrants, including a popular imam at a San Diego-area mosque, were convicted by a U.S. federal jury on Friday of conspiring to provide material support to an al Qaeda-linked Islamist militia in the Horn of Africa nation. The U.S. Attorney's Office for the Southern District of California said that the men - the imam, two cab drivers and an employee at a money transmitting business - had conspired to raise and send money to Somali al Shabaab rebels. ...