First commit: Basic working sound generator

 Initial commit
	new file:   include/pa_linux_alsa.h
	new file:   include/portaudio.h
	new file:   lib/libportaudio.a
	new file:   src/paex_saw.c
	new file:   src/paex_sine.c
	new file:   src/soundgen.c
Merge branch 'master' of https://github.com/crashmatt/wavegen