renamed class and file
Add unit test file

This will help to keep the class working as it gradually changes.
Furthermore as I plan to refactor it, it will help make sure that
the functionality remains the same
Improve printed sorting

The printed function now prints elements with decreasing frequency
but for similar frequencies it uses alphabetic order
Refactor into a more pythonic way

Changed some of the functions to be more python 3 compliant,
removed some sideffects
Implement ability to exclude words

It is still quite primitive. Added unit tests as well
Removed sample code from the main module

Instead added sample.py where use of the module is displayed
Add word count method
Add unique word count and test cases

Also added some docstrings