Here's what we learned from Diane Keaton's AFI tribute, where Al Pacino, Martin Short, Steve Martin, Meryl Streep, Woody Allen, Warren Beatty, Morgan Freeman, Reese Witherspoon, Nancy Meyers and more lauded her amazing life and career. When Diane Keaton accepted the 45th AFI Life Achievement Award from Woody Allen in Hollywood Thursday night, it was the end of one of the more memorable AFI tributes. And as one actress after another explained why Keaton was such a significant role model — from