Shares of Red Robin Gourmet Burgers (RRGB) sizzled after a fourth-quarter earnings beat Tuesday morning. A plate of other casual dining restaurants served up mixed results after the close. Red Robin reported Q4 EPS of 59 cents, up 111% from a year ago, and 15 cents over analysts' expectations. Revenue soared 17% to $240.7 million, topping expectations for $232.3 million. It expects to grow sales at established restaurants by 2.5% to 3% in 2013, on