Version 0.3 released

I have released 03 of PyAlsaaudio.

This release makes PyAlsaaudio suitable for multithreaded use (it releases the GIL for blocking calls).

This closes all outstanding bugs and patches, in particular issue 1390133: http://sourceforge.net/tracker/index.php?func=detail&aid=1390133&group_id=120651&atid=687748"