The promise that Ranbir Kapoor displayed in Saawariya, his debut venture, has been duly fulfilled in this breezy, urbane tale of love and longing, set against a come-of-age backdrop of 21st century twenty-something Indians. Here is a crackling bunch of gals and guys who mirror the mores and manners of modern India. And leading the bratpack, or should we say, carrying the film through, is the