release 4.4.0

[cehbrecht]

Overview

Update changes for release 4.4.0

Related Issue / Discussion

574 and #568

Additional Information

Contribution Agreement

(as per https://github.com/geopython/pywps/blob/master/CONTRIBUTING.rst#contributions-and-licensing)

• [ ] I'd like to contribute [feature X|bugfix Y|docs|something else] to PyWPS. I confirm that my contributions to PyWPS will be compatible with the PyWPS license guidelines at the time of contribution.
• [x ] I have already previously agreed to the PyWPS Contributions and Licensing Guidelines

[cehbrecht]

When this PR is accepted I will make the 4.4.0 release. We will use it for testing and fix open issues in 4.4.1.

[coveralls]

Coverage remained the same at 0.0% when pulling 85f3fd7754f408e55b321138d3acfd37a039f242 on cehbrecht:release-4.4.0 into e10c99c2c8472287f9463bab49d85f5e7597cac2 on geopython:pywps-4.4.