LOS ANGELES (Reuters) – The Grammy Museum unveiled a tribute to Whitney Houston on Wednesday, put together by family members to celebrate the late pop star's career. The exhibit, titled "Whitney! Celebrating the Musical Legacy of Whitney Houston," features items such as the singer's iconic gowns, some of her Grammy awards, film scripts, modeling shots and personal memorabilia. Highlights include a beaded gown that Houston wore at the 1994 Grammy Awards, private letters from legendary music producer Clive Davis and a tea cup that Houston drank out of before each performance. …