Odoo-autodiscover

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- better deprecation warnings for autodiscover scripts
- improvements to setup.py and readme
- add test for Odoo 11 and python 3 where odoo-autodiscover is not necessary

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- major rewrite: instead of adapted startup scripts that monkey patch Odoo,
use a post import hook that automatically does the job as soon as odoo or openerp
is imported.
- for Odoo 10 and 11, do not rely on namespace packages, but instead look for odoo/addons
directories in PYTHONPATH
- automated tests
- Odoo 10 support, to work around https://github.com/acsone/setuptools-odoo/issues/10
- preliminary Odoo 11 support

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- odoo-autodiscover is built-in Odoo 10!

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- [IMP] add openerp-gevent-autodiscover, and monkey patch the prefork server
to launch that script instead of openerp-gevent.

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- [FIX] odoo-autodiscover.py: more reliable way to discover and import
the official odoo.py script, so it will now work when Odoo is installed
from the deb package

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- initial stable release