Setuptools-odoo

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- [ADD] mechanism to specify which Odoo version to use in dependencies
(8.0, 9.0) in case some addons to be packaged have non-standard version
numbers
- [ADD] support for addons without version number in their manifest
(unfortunately there are some in the wild...)

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- [ADD] mechanism to override dependencies, to allow addon authors to
require minimal versions of dependent odoo addons, and to control external
python dependencies

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- [FIX] fix postversioning when running outside git directory
- [IMP] additional mappings for python external dependencies
- [ADD] make_pkg_name public api to convert an addon name to a python
package name
- [ADD] make_pkg_requirement public api to obtain a valid package requirement
for a given addon (same as make_pkg_name but includes requirement
for the correct Odoo series)
- [FIX] crash in case a previous commit had a bad `__openerp__.py`

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- first beta