Release Name: rubychess-0.6a

Notes: This is the initial alpha release of rubychess-0.6a, which is a line-by-line port of pythonchess-0.6. There are, unfortunately, some bugs remaining to be fixed. These bugs will cause the game to stop when it gets close to figuring out how to checkmate you. Hopefully some bright Ruby programmers will jump aboard and help me bring this port of pythonchess to Ruby to its completion. Thanks in advance for your help!