Added windows compatibility and a couple bugfixes

-extractFormants.py updated to work with Windows (using windowsPC=T config option)
-updated the readme with a guide on how to install FAVE-extract on Windows
-bugfix in praat.py
-changed getWordsAndPhones() to search the phone tier once per word instead of once per textgrid, which slows it down a little bit but keeps it from dropping all of the vowels following a textgrid alignment error