Enlighten

* Convert from module to package
* Examples included in sdist
* Fixes for tests in some environments

- Documentation updates
- Minor optimizations

Initial release

**Changes**
- Column position is preserved when updating progress bars 73
- Previously it always returned to the start of the line
- This allows printing to the console with partial lines
- Does not preserve column position on resize
- New method ``reset()`` added to StatusBar and Counter 72
- Resets counts and timers to initial state