Merge branch 'develop' of github.com:aubio/aubio into develop

diff --cc Makefile
index c4b2b91,fcf3ce3..7cef2c4
--- 1/Makefile
--- 2/Makefile
+++ b/Makefile
@@@ -25,11 -21,17 +25,17 @@@ build_python
  clean_python:
        cd python && ./setup.py clean
  
+ build_python3:
+       cd python && python3 ./setup.py build
+ 
+ clean_python3:
+       cd python && python3 ./setup.py clean
+ 
  clean:
 -      ./waf clean
 +      $(WAFCMD) clean
  
  distcheck: build
 -      ./waf distcheck
 +      $(WAFCMD) distcheck
  
  help:
 -      ./waf --help
 +      $(WAFCMD) --help