JOINT FILING AGREEMENTJoint Filing Agreement • September 4th, 2012 • Discovery Group I, LLC • Retail-auto & home supply stores
Contract Type FiledSeptember 4th, 2012 Company IndustryDISCOVERY GROUP I, LLC for itself and as general partner of DISCOVERY EQUITY PARTNERS, L.P. By: /s/ Michael R. Murphy* Michael R. Murphy Managing Member