PyMedia 1.2.1 is out

This release features dvd read capability + some basic audio resampling.
The following things were added:
* pymedia.audio.cd -> pymedia.removable.cd
* dvd read added( libdvdread and libdvdcss )
* audio resampling added into pymedia.acodec.Resampler
* generic interface for removable medias ( pymedia.removable.cd )