Merge branch 'release/2.4.0.7' into develop
Bump to development version 2.4.0.8dev
Revert "Moved IrAttachment from nereid-project to nereid."

This reverts commit 6e78fba2eaa956d4a95600de7fc1897331b60d38.
This is part of the changes required for inclusion into tryton.
See Issue #1
Update to Active Record #647
Update travis.yml to use the 2.6 branch of nereid
Update README, INSTALL and MANIFEST.in
Merge branch 'feature/2.6' into develop
Merge branch 'release/2.6.0.1'