Docs: Development Environment

[gronke]

We introduced code checking with flake8 and mypy, but did not document how to configure and use the development environment.

At least developers need to know a list of dependencies and some helper to install them on FreeBSD and HardenedBSD.

• Makefile
  • make travis runs the same tasks as they would on TravisCI
  • make test runs the code style checks and unit tests
  • make dev-dependencies installs developer dependencies (and general dependencies)
  • make install installs libiocage to the system
• Readme
  • lists general iocage dependencies
  • lists iocage development dependencies
  • explains how to setup the development environment using make dev-dependencies

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[igalic]

Travis is running: make check and make check-deps to install the deps needed for that

[gronke]

We simplified the Makefile and made (dev-) dependencies self-explaining.