PyJack isn't built by Scons

[davissorenson]

In order for the jack-transport branch to be merged, this needs to be fixed.

The code for PyJack can be found here on SourceForge, it includes the call to Python distutils that builds it. I know next to nothing about writing Sconscripts or Sconstructs, so this is an open issue that I would like help with.

The module needs to be made importable without running scons install (or whatever it is. I don't even know!).