Litio

To be more developer-friendly with module developers, you can now test your module by installing it from a tar file without having to publish it on GitHub.

Features:
- now you can install modules from branches

Fixes:
- import error with gitpython, adding it to requirements

Features:
- Now you can create and install modules that change the functionality of litio.

Changes:
- The litio structure is now modular.
- Tests are now executed with the "run" sub-command.

Features:
- Improved value comparison with dot access
- Various bugs fixed
- Updated documentation

Features:
- Changing output style
- Adding the possibility to include more output styles
- Adding the possibility to ignore tests
- Various bugs fixed