Fix "ImportError: No module named 'drivers'" upon init().

I could install the jpercent fork (Python 3.4, Windows) but it would fail with an import error upon calling init().

I don't yet understand Python3 well enough, but the Python path was not going into pyttsx to see drivers directory.

Changed code so explicitly encourage Python where to look.

See for more: http://stackoverflow.com/questions/24963638/import-pyttsx-works-in-python-2-7-but-not-in-python3/26613255#26613255