The sun is out, the lawn is ready to be mowed and after a couple of films as a warm-up I think it’s safe to say that summer blockbuster season is open for business. Oblivion and Olympus Has Fallen both served as decent appetisers but it’s now time to get serious. We’re now in Avengers Phase Two and it’s kicked off in some style with the return of Tony Stark in Iron Man 3…