Doit-py

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- drop support for python 2.7, 3.3, 3.4
- add support for python 3.6, 3.7, 3..8

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- Coverage support param `--concurrency`
- support python 3.5

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- rename module `pypi` to package
- create `package:manifest` creates a `MANIFEST.in` so it works with setuptools

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- added module `docs`
- added module `pypi`
- coverage: support coverage of single modules
- coverage: remove support getting a string path as a parameter
- remove `confclass` module, use external `configclass`
- `install_requires` does not include requirements for all modules
i.e. you need to manually install `pyflakes`, `coverage`,...

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- pyflakes: consider 'unicode' a builtin even on py3 to support code
compatible with both py2 and py3.

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- added pyflakes module
- added coverage module