By Piya Sinha-Roy LOS ANGELES (Reuters) – Pop singer and Nickelodeon TV star Ariana Grande stormed to the top of the Billboard 200 album chart on Wednesday with her debut "Yours Truly," staving off new entries from Tamar Braxton, Nine Inch Nails and John Legend. "Yours Truly" sold 138,000 copies in its first week, according to figures from Nielsen SoundScan. It was helped by Grande's catchy lead single, "Love the Way," with rapper Mac Miller, which has been a staple on the radio this summer. …
