More than 130,000 comic book fans are expected to make the trek to San Diego later this week for Comic-Con, a massive convention celebrating all things related to comics books. But in this digital age, fans can now get their “superhero fix” in more ways than ever before. Flipping through the pages of your favorite comic book isn’t what it used to be, music and sound effects are now part of the story. Marvel Comics, the industry’s leading publisher, now offers readers the ability to put tens of thousands of comics at their fingertips, using a streaming app for tablets or smartphones.