Quad City Music Guild’s summer season winds down with one of the big American musicals: Gypsy, directed here by Troy Stark, and featuring a score by Jule Styne, book by Arthur Laurents, and lyrics by an early-career Stephen Sondheim. And while there were a few rough spots during Friday’s opening-night performance, there’s still plenty to enjoy and Guild does a fine job of putting this classic piece on its feet.