Open-Tamil porting for Python 3 and Python 2

For a long time Open-Tamil package was envisioned and supported for both Python 3 and Python 2. Now in work done during last weekend (during harsh Boston winter what better than sit indoors and code away?) I have made the following changes,

  1. source code compatible for both Python 3 and Python 2,
  2. pass unittests on Python 2.6, 2.7, 3.3 and 3.4 with Travis-CI testing , and running successfully on Windows and Linux

This is still development bleeding edge software so please feel free to poke and play, and file bugs. Let us know if you are using open-tamil in your work.