Add bool definitions
Move test program to a test subdir
wav: Add broken version based on tinyalsa
fix building tests
wav: Set the right playback destination
nano_add_usec: Fix numeric overflow
wav: Working update function and talking skull
externals

Add external libs instead of requiring that I keep checking
these out and building them.  I don't expect them to change
much anyway.
Makefile: cleanup the output
wav: Remove debug printf
piface: Add digital interface to piface and use it in wav
Rename test/wav to test/talking-skull
wav: Refactor the servo track extraction
wav: Add the ability to generate the servo data from the audio
audio wrapper
wav: Add missing destroy function
refactor wav_play to use the audio wrapper
audio: Correctly set the volumes
Refactor talking-skull logic into its own object
talking-skull: print less when PRINT_SERVO