Add a modified traceback.

This new module should log exceptions with logger.
All local variable are logged and attributes of current object too.
Add some files to ignore.
Added a default logging conf.
The new main module.

The frontend for the cmd line.
Added basic argparse options.
Merge branch 'master' of github.com:Djabx/mgd
... reprise du code...
Un peu de ménage et des tests qui passent...
Encore plus de ménage
Passage à git flow.
Add test for:
Site
Book

Add some repr string in model
Mise en forme.
Ajout de test pour:
Chapters et Contents.
Renaming store -> model
Renaming test suite according

Use of session_scope in tests
Ménage dans le module de logging.
Utilisation de versioneer pour la gestion des numéros de version
Modification for readers, how they work.
can't write properly...
Modification of the long description (not README.md anymore).
Use of the readers module (and not register anymore).
Load all readers
modification of logger initialization.