aubio 0.4.1

This is a work in progress, it does not work right now. Does anybody know why I'm getting these messages?

```
ld: warning: ignoring file /usr/local/Cellar/libsamplerate/0.1.8/lib/libsamplerate.dylib, file was built for x86_64 which is not the architecture being linked (i386): /usr/local/Cellar/libsamplerate/0.1.8/lib/libsamplerate.dylib
ld: warning: ignoring file /usr/local/Cellar/libsndfile/1.0.25/lib/libsndfile.dylib, file was built for x86_64 which is not the architecture being linked (i386): /usr/local/Cellar/libsndfile/1.0.25/lib/libsndfile.dylib
ld: warning: ignoring file /usr/local/Cellar/ffmpeg/2.2.3/lib/libavcodec.dylib, file was built for x86_64 which is not the architecture being linked (i386): /usr/local/Cellar/ffmpeg/2.2.3/lib/libavcodec.dylib
ld: warning: ignoring file /usr/local/Cellar/ffmpeg/2.2.3/lib/libavformat.dylib, file was built for x86_64 which is not the architecture being linked (i386): /usr/local/Cellar/ffmpeg/2.2.3/lib/libavformat.dylib
ld: warning: ignoring file /usr/local/Cellar/ffmpeg/2.2.3/lib/libavresample.dylib, file was built for x86_64 which is not the architecture being linked (i386): /usr/local/Cellar/ffmpeg/2.2.3/lib/libavresample.dylib
ld: warning: ignoring file /usr/local/Cellar/ffmpeg/2.2.3/lib/libavutil.dylib, file was built for x86_64 which is not the architecture being linked (i386): /usr/local/Cellar/ffmpeg/2.2.3/lib/libavutil.dylib
```