Regenerate SWIG wrappers using swig 2.0.12

The only "real" change is that ASSOCIATE_FILESYSTEM_ENCODING was added
to aiff and wav as well. The reason they were not there before was that
they were branched before that change was made on master.
Merge pull request #61 from robinst/swig_2.0.12

Regenerate SWIG wrappers using swig 2.0.12