The discount retailer has almost doubled since bottoming out this summer. A strong quarter and new CEO are leading the charge this week.Shares of Five Below (FIVE 1.72%) have been moving higher in recent weeks. A "beat and raise" quarterly update on Wednesday afternoon and tapping a new CEO should keep gains coming.The cheap-chic retailer has been a wild ride for investors this year. Five Below shares were trading 70% lower year to date when they bottomed out in August. The chain that is popular with teens ...