GC-2: Added flake8 configuration file:

- Updated package manifest file to include the flake8 configuration
file in generated source distribution.
- Set the maximum line length limit to 160 characters.

GC-2: Added coverage configuration and updated manifest file:

- Include only the actual module files in the coverage reporting.
- Addd comments to gitignore file.
- Updated gitignore file to exclude test artefacts.
- Updated manifest file to include documentation files, as well as
test configuration file.
- Added pytest configuration file that ensures coverage plugin is
enabled and that report is stored in html format in the coverage
directory.

GC-2: Added initial package setup configuration:

- Updated gitignore to exlude some of the build and Python artefacts.
- Added manifest file, including a number of files that are not
normally being distributed.
- Created setup.cfg that overrides default command for running tests.
- Added initial setup.py.