Implement initial project skeleton.

The following should be done:

• Project should be released either under BSD or GPLv3 + CC-BY-SA-3.0 (code + documentation) license. It might be better to go for GPLv3 + CC-BY-SA-3.0 since it's not a library.
• Ensure that all files have proper licensing headers at top.
• Add relevant license files.
• A dummy project directory should be created with __init__.py within.
• A dummy tests and functional_tests directories should be created with __init__.py within.
• Add initial documentation using Sphinx:
  • Include README.rst at top-level directory with basic information about the project:
    • About Gimmecert section. Ensure to list compatibility (Python 3.4+).
    • Why was this applicaiton created section.
    • Features section (placeholder for now).
    • License section, mentioning the license for code and docs.
  • Include basic instructions for development:
    • Setting-up environment.
    • Running tests (via tox - including docs - and directly).
• Create Python package configuration (setup.py and MANIFEST.in):
  • Ensure to add additional extras flags, like test, testlint, devel, and doc.
  • Ensure to include tox, pytest, pytest-cov, pytest-flake8,flake8, andsphinx` in requirements.
  • Make sure pytest is used for running tests.
  • Dependency should be implemented using the extras flags for tests and development.
  • Look at Django Wiki for inspiration on extras and using pytest as default test-runner.
  • Ensure project is marked for use with Python 3/3.4+.
• Create coverage configuration:
  • Coverage reports should be generated by default in html format.
  • Coverage reports should be stored in directory coverage.
  • Ensure that coverage is applied by default against just the project module.
• Create tox configuration:
  • Environments for running tests under Python 3.4, 3.5, and 3.6, as default targets.
  • Environment for running lint tests under Python 3, as default target.
  • Environment for test documentation building under Python 3, as default target.
• Create flake8 configuration:
  • Increase maximum line length to 160.
• Create initial .gitignore, making sure to:
  • Ignore build artefacts.
  • Ignore temporary files.
  • Ignore test artefacts.