UPDATE with more info from news conference: San Diego Mayor Kevin Faulconer this morning is making official what had been expected for some time — that his city is keeping the annual Comic-Con convention through 2018 in a new deal just finalized. The previous contract with Comic-Con International was due to expire after this current year’s confab, which kicks off next week. The two-year extention, being unveiled now at a press conference, comes after months of…