Sure, we're still waiting for that Microsoft-Skype deal to close, but it looks like Redmond's about to get more than it initially bargained for. Skype announced today that it has reached an agreement to snatch up Groupme, the mobile group messaging service that made a splash at Google I/O. Outfit head honcho Tony Bates told TechCrunch that Skype needs to invade the mobile space if it hopes to reach its goal of scoring one billion users, and cites Groupme's "sticky group messaging experience" as