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Documentation review and development environment refactoring: let's try to
simplify usage and development of `hospital`.
- Feature 25: the Makefile in project's repository no longer creates a
virtualenv. Developers setup the environment as they like, i.e. using
virtualenv, virtualenvwrapper or whatever. Added documentation about the
Makefile scope and usage.
- Feature 19: reviewed contributor guide, added branching policy.
- Feature 24: added note about project's status in documentation.
- Feature 21: reviewed API documentation.
- Bugfix 18: README can be rendered as HTML with `docutils`' ``rst2html.py``.
Fixes PyPI information page.