fix: doc: ReST inconsistency between generated changelog and ``README…

….rst``.

This prevented PyPI page to be rendered properly.

chg: pkg: updating to new packaging tools.

- Simplifies travis files, and add dovis packaging checks.
- Update licence info, as it is now part of the checks.
- Windows appveyor checks added, windows compatibility of the packaging tools.

chg: typo and small rephrasing in docs !minor

fix: nasty cache collision if two custom objects shared the same hash…

… and type but where not ``equal``.

And as a matter of fact, this happens. For instance, all instance of
``object`` or any subclass will inherit a special ``hash`` method that
uses ``id``, but in some version of python (the recent ones), the ``id``
value is divided by ``16``. And hash collisions are to be expected
anyway, and of course should not cause cache collisions.

chg: pkg: update packaging tests.

- removed non usefull call to ``autogen.sh``
- test distant pip installability
- test importability
- test uninstallability

first import.