(Note: Strong language in paragraph 4) By Brent Lang LOS ANGELES (TheWrap.com) – Rihanna and Beyonce expressed their outrage and shock about George Zimmerman's acquittal this weekend in the shooting death of 17-year-old Trayvon Martin. Beyonce called for a moment of silence during a concert appearance in Nashville, Tenn. on Saturday, before singing a chorus of "I Will Always Love You" as a tribute to the slain young man, according to a report in the Associated Press. Rihanna voiced her objections to the jury's decision on Instagram. …