Changes from 0.1 to 0.2.0
- added CDAudio class.
- endian aware header parsing and endian as part of info block.
- case insensitive compares added.
- dialogic adpcm uniquely identified.
- riff (wave) create/read support added.
- 8, 16, and 32 bit pcm linear audio formats added.

Changes from 0.2.0 to 0.2.1
- fixed endian calculations.
- protect conversion routines from div. by zero.
- fixed mulaw in au header reading.
- fixed frame fill routine.
