What would Ebenezer Scrooge, one of fiction’s most enduring characters, say?”Bah Humbug!” or “There’s an app for that!”Chuck Fischer, who last year turned A Christmas Carol into a pop-up book, has gone digital this season with an app based on Charles Dickens’ 1843 novella that changed the way the holiday is celebrated. @Yungjohnnybravo @TatWZA