Photo: Paul Kolnik It's summer, which means it's time for glossy, eye-popping, multi-million dollar blockbusters. And those aren't just limited to movie screens. The touring production of the wildly popular, multiple Tony-nominated musical adaptation of Alice Walker's now-classic novel The Color Purple is in D.C. for the next month, and is just as jaw-dropping a spectacle as anything Hollywood has in store. Not that Hollywood doesn't play its part here. The musical is as much an adaptat