remove active in __openerp__.py
port models and method to api 8.0
add .mailmap to fix authors for git-shortlog
add tests
Merge pull request #34 from yvaucher/7.0-add-mailmap

add .mailmap to fix authors for git-shortlog
Merge pull request #28 from yvaucher/8.0-sale_validity

8.0 port sale_validity