[10.0][MIG] project_closing: Migration to Odoo 10

[Jerther]

• Migration of module project_closing. The project.state field has been replaced by project.active so the module must follow this modification.
• Addition of unit tests.

[oca-clabot]

Hey @Jerther, thank you for your Pull Request.

It looks like some users haven't signed our Contributor License Agreement, yet.
You can read and sign our full Contributor License Agreement here: http://odoo-community.org/page/website.cla
Here is a list of the users:

• @Jerther (login unknown in OCA database)

Appreciation of efforts,
OCA CLAbot

[Jerther]

Hmm, yes we did sign the CLA. I did receive the confirmation email less than an hour ago though.

[oca-clabot]

Hey @Jerther,
We acknowledge that the following users have signed our Contributor License Agreement:

• @Jerther

Appreciation of efforts,
OCA CLAbot