Kanye West is back, and seemingly everywhere. Including at the Boston Public Library, where you can reserve five CD's of his latest album: My Beautiful Dark Twisted Fantasy. It's also available in rare vinyl at Newbury Comics, where sales have been brisk. The rapper has become known as much for his controversial outbursts as his music: like his claim that former president George Bush didn't care about black people in the wake of Hurricane Katrina, or his infamous interruption of Taylor Swift at the 2009 MTV Video Music Awards. After his self-imposed exile from the limelight following that …