Setuptools-odoo

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- [FIX] fix issue when odoo/addons has no __init__.py.

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- [IMP] update base addons list for Odoo 10.0
- [IMP] when setuptools extends a list-type keyword, prevent duplicate items
- [IMP] make tests pass with python 3
- [ADD] preliminary Odoo 11 support
- [IMP] BREAKING: remove LEGACY_MODE support
- [IMP] python_requires is now part of the generated keywords
- [CHG] In the classifiers, use Python instead of Python :: 2.7
since we now have python_requires that is more precise

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- [ADD] add license classifier for the licenses commonly used in OCA

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- [ADD] support the brand new Framework :: Odoo classifier

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- [FIX] avoid setuptools-git version 1.2 as it is broken for
our use case

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- [FIX] git based automatic postversioning was not working
in situations where the manifest was renamed (eg when
renaming ``__openerp__.py`` to ``__manifest__.py``)
- [IMP] support author email: since the Odoo manifest has
no such concept this is currently just a special case
when OCA is in the authors