Add `tox.ini` config with supported versions, and a new tox CI
workflow to run tox tests on master branch changes. This is "expensive"
so we may consider limiting execution further.
* Make `build_examples.py` callable from python
* Allow tests to run from outside project directory
* Add invoke tasks
* Add server tests
* Run travis tests against wheel package instead of local code
* Update `badge.write_badge()` to support `pathlib.Path`
* Update `CONTRIBUTING.md`
- Add .pre-commit-config.yaml with initial config.
- Add python black pre-commit config
- Apply pre-commit code changes
- Add information to CONTRIBUTING.md
- Add pre-commit to build requirements
- Run pre-commit during travis CI build
- Use a travis build matrix to control when pre-commit runs
in the CI process. Use explicit include to only run
pre-commit on Python 3.9.
Python version support
======================
- Drop Python 2.7 support
- Add testing for Python 3.4 and 3.9
- Set python version requirements in setup.py
Package changes
===============
- Split module up into a package with submodules
- Break templates out into package resources
- Incorporate server into same package
- Use Enum for colors
- Refresh example badges
- Simplify documentation - Remove cli options and python api
documentation from the README as it is hard to maintain, and
often goes out-of-date
- Add CONTRIBUTING.md
