As the summer ends, start labor day sale. Here are six bargains for this September.By STEVEN RUSSOLILLO of this September may be not so cruel might suggest for the US stock market as a history – and some current technical trends. September is usually the worst month in the calendar for has investors. The standard & amp; Poor’s 500 HasJohn Fortt of CNBCs fast money halftime report says that “someone” familiar with the plans told him that “Facebook is planning his long music service at the f8 Conference rumored on 22 September.” Fortt GoesJohn Fortt of CNBCs fast...