Food delivery websites join to stave off competitors
                                
                                
                                    (Newser) -
                                    Yahoo and Tumblr  weren't the only online properties getting into bed together today: GrubHub and Seamless, two of the largest food-delivery websites in the US, have announced a merger, combining forces to fend off an increasing number of startup rivals,  Bloomberg  reports. "This has nothing to do...