Wavefile

- Temptative support for freebsd

- Build fixes

- Dropped Python<3.8
- Incorporated enums for all the new formats supported by sndfile up to 1.0.31
- Containers: mp3, opus
- Encodings: NMS ADPCM, MPEGx Layerx
- Experimental: Api to enumerate, check and describe formats
- Added `Writer.seek` method
- Added example for whole-file load/save
- wavefile.save accepts 1D mono data for convenience
- PR23 Incorrect implementation of saveWave method. Fixes 20. Thanks Sravan Patibandla (pbskumar)!
- This will render some client code failing. But I applied it since
it is coherent to have the same layout on saving and loading.
Client code should now transpose the numpy matrix when saving with wavefile.save()

- MacOSX support
- Fix: Genere string accesses the proper id (closes 18)
- PyAudio an optional dependency (just used by examples)
- New stuff from libsndfile 1.0.26 included

- Works with Python 3.0 to 3.2, patch from j3ffhubb
- Works on cygwin, patch from j3ffhubb
- Added readf/writef functions, patch from Tim Langlois
- Ctypes backend clean up, removing lot of legacy code
- Using libsndfile soname (runtime packages) instead of link name (development)
- Tests can be run from setup
- Travis support

- Fix: Whole-file interface works again, regression tests added
- Added a helper script to run tests in Py2 and Py3
- Using utf8 for tags