slack-rtmapi 1.0.0.rc3

slack-rtmapi is dumb: no EventMachine, no Celluloid, no Actor design pattern, no thread pool (thought, any of those would be trivial to add). It's a simple blocking loop on top of a SSL socket with a websocket decoder. Minimal dependency. Works out of the box. Hackable. Composable. Oh, by the way, it implements very well the Slack API.