Update various docstrings.
Change copyrights dates in "docs.sphinx.source.conf" module.
Code formatting.
Update documentation / help files.
Update various variables name.
Remove verbose logger in "utilities.sanitizer" module.
Update "Pypi" setup file.
Raise package release version number to "2.1.0".
Update documentation / help files.
Update "travis-ci" setup file.
Implement magic methods tests for "foundations.parsers.SectionsFileParser" class.

Closes #19.
Ensure "foundations.parsers.SectionsFileParser.parse" method reads current file content if no content has been previously set.

Closes #21.
Update various docstrings.
Code formatting.
Update "foundations.environment.getSystemApplicationDataDirectory" definition.
Extract and add  "foundations.guerilla" module from "Umbra" package.
Update "foundations.__init__" module.
Ensure that loggers and their formatters receive unicode data.

Closes #22.
Add "foundations.io.isWritable" definition and associated units tests.
Handle "BadZipfile" exception in "foundations.pkzip.Pkzip.extractZipFile" method.

Closes #23.