Cihai

- Update pytest to 3.8.0
- Update sphinx to 1.7.9
- _util_ -> _utils_
- _conf_ -> _config_
- Add `cihai.__version__` (so the version is available without having to access `__about__`)
- Add source code link on GitHub on API pages
- Add `__github__` to `__about__`
- Move `DEFAULT_CONFIG` to _constants.py_
- Move _cihai/unihan.py_ -> _cihai/unihan/{**init**.py,dataset.py}_
- Move _cihai/bootstrap.py_ -> _cihai/unihan/bootstrap.py_
- Treat Unihan as a `Dataset`
- Automatically include dataset when created `c = Cihai()`, `c = Cihai(unihan=False)` will do
without
- Tests for examples. We want to make sure our examples work out of the box and new changes catch
API breaks when they need updating

- Loosen kaptan requirement to greater than 0.5.10, less than 0.6

This should fix issues with pyyaml, as well as downstream with cihai-cli.

- Loosen other version requirements to avoid entanglements downstream in the future.
- Update Sphinx to 1.7.5 to 1.7.6

- Update unihan-etl to 0.9.0 to 0.9.5
- Base package updates

- sqlalchemy 1.1.10 to 1.2.8
- kaptan 0.5.8 to 0.5.9

- Developer package updates (linting / docs / testing)

- isort 4.2.5 to 4.3.4
- flake8 3.3.0 to 3.5.0
- vulture 0.14 to 0.27
- sphinx 1.5.6 to 1.7.5
- alagitpull 0.0.4 to 0.0.21

- bump unihan-tabular 0.8.1 to unihan-etl 0.9.0

- Update unihan-tabular to 0.7.3, adds _kJa_ and fixes _kCompatibilityVariant_.

- Support for character lookup and reverse lookup
- Code examples in _/examples_