Anybox-pg-odoo

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- fixed error in Python 3
- implement graph option ``odb log --graph``
- fixed `issue 7
<https://bitbucket.org/anybox/anybox.pg.odoo/issues/7/revert-on-used-db>`_,
force to close exists connexion on copied database before make the copy
- Implement `issue 4 <https://bitbucket.org/anybox/anybox.pg.odoo/issues/4/
limit-option-to-odb-log>`_ **limit** log option to limit number of changes
displayed

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- fixed error in Python 3
- remove tag and message of the current version after commit and revert

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- Works on Python 3.1+
- Works on Postgres 9.1 and maybe lower
- ``odb purge keeptags`` : purge all but tags
- implemented commit message
- revert now checks that the source db exists (much safer)

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- Implemented ``odb log``
- Implemented ``odb purge``
- Implemented ``odb tag`` and revert to tag
- Implemented ``odb tags``
- Renamed version to revision
- Renamed snapshot() to commit()

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- Keep the same db as the current one to work in place
- Fixed versionning and start at 1
- Also disconnect during revert operation
- Removed the unneeded tip

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- Fixed packaging
- Fixed the ``revert`` behaviour
- Allow to revert without argument
- Improved doc