v0.3.0

Added

• Add the decorator data to the public interface.
• Add support for coverage and tox.
• Add continuous integration with Travis and coveralls.
• Add a few bling-bling badges to the readme.
• Add a Makefile to regroup common actions for developers.

Changed

• Improve the documentation.
• Improve the unit testing workflow.
• Remove the __slots__ attribute from the Settings and Patch
  classes.
• Refocus the content of the readme.
• Define the 'long_description' and 'extras_require' metadata to setuptools'
  setup.
• Update the documentation's Makefile with a simpler template.
• Rework the '.gitignore' files.
• Rename the changelog to 'CHANGELOG'!
• Make minor tweaks to the code.

Fixed

• Fix the settings not being properly inherited.
• Fix the decorator data not supporting class inheritance.