LOS ANGELES - Rocker Melissa Etheridge plans to tie the knot at the end of this year with her companion of two years, actress Tammy Lynn Michaels. "This is the first wedding for both of them," Etheridge's publicist, Marcel Pariseau, said Tuesday. He declined to reveal plans for the ceremony except to say it would take place in Los Angeles. Etheridge, 41, has been dating Michaels, 28, for about two years, Pariseau said. The musician shares custody of a daughter and a son with former partner Julie Cypher. The two made news in 2000 when they revealed that musician David...