Image source: Buffalo Wild Wings.What: Shares of Buffalo Wild Wings (NASDAQ: BWLD) jumped as much as 13.9% early Wednesday, and traded up 9.8% as of 1:00 p.m. EDT after the wings, beer, and sports-centric restaurant chain released better-than-expected second-quarter 2016 earnings.So what: Quarterly revenue grew 15% year over year, to $490.2 million, as contributions from new restaurant openings and franchise acquisitions more than offset same-store sales declines of 2.1% and 2.6% at company-owned and franchised locations, respectively.