Base implementation of the PPP datamodel.
Add .travis.yml.
Add Pylint.
Add Travis.
.travis.yml: Upload coverage to Scrutinizer.
Revert ".travis.yml: Upload coverage to Scrutinizer."

This reverts commit ea5326b4a1be478689d9619ac5b9fc82f04fdd83.
Fix CPython 3.2 / Pypy3 compatiblity.
Merge pull request #1 from ProjetPP/base

Base implementation of the PPP datamodel.