Be more explicit with paths in Makefile

Ignore files in .tox/ directory.
Use PySide (Python QT4/5 bindings) instead of TKinter.

This looks more modern and the UI designing is much easier
by using QTCreaotor.
Integrate the new GUI framework
Apply naming changes
Some PEP8 cosmetics
Don't check the test coverage for the GUI stuff
Merge pull request #30 from bh/gui-with-qt

Gui with QT