Merge 0.4.0

diff --cc README
index bc6f6da,9ae0518..d812197
--- 1/README
--- 2/README
+++ b/README
@@@ -12,13 -12,13 +12,14 @@@ of audio that are quieter than a given 
  plugins compile into a single plugin library called vamp-aubio.so (the
  file extension may vary depending on your platform).
  
--To build: Make sure you have aubio-0.3.2 or newer installed, and the
--Vamp plugin SDK.  These are available at the URLs given at the top.
--Edit the Makefile appropriately, and type "make".  If the build
--succeeds, copy the vamp-aubio library file into your personal or
--system Vamp plugin location.
++To build: Make sure you have the Vamp plugin SDK and aubio
++installed. (A version of aubio dating from at least July 2012 is
++required.) These are available at the URLs given at the top.  Edit the
++Makefile appropriately, and type "make".  If the build succeeds, copy
++the vamp-aubio library file into your personal or system Vamp plugin
++location.
  
 -These plugins are Copyright 2007 Chris Cannam, distributed under the
 +These plugins are Copyright 2007-2012 Chris Cannam, distributed under the
  GNU General Public License.  (Of course, the real work is done by the
  aubio library.)