HBO has revealed the list of titles arriving to and leaving its standalone streaming service, HBO NOW, in May. It's a huge month for the services' original series, mostly in the way a few of them will be gone forever. Game of Thrones' series finale will be available on May 19th, while the series finale of Veep will hit the service on May 12th. The finale of Barry's stellar season 2 will also be available on the 19th. If endings aren't your bag, there will always be more Thrones! The behind-the-scenes documentary Game of Thrones: …