Release 2.13.0

Prepare release 2.12.0

Prepare release 2.11.1

Prepare release 1.12.0. Upgrade lxml, isodate and defusedxml dependen…

…cies

Release 2.10.0

Release 2.9.0

Release 2.8.0

Release 2.7.0

Release 2.6.0

Release 2.5.0