Shake Shack's grand opening isn't the only good food news to hit the Central West End today.This morning Travis Howard and Tim Wiggins of Retreat Gastropub(2 North Sarah Street, Central West End) announced plans to open a second concept in the neighborhood in mid-2018. Known as Yellowbelly, the restaurant and bar will be "a sea and spirits concept," with a seafood-centric menu and a beverage program focused on rum, craft beer, wines by the glass, cocktails and more.…