* Make several changes in the release and CI setup.
- Remove .travis/ directory completely.
- Update deploy.py script to tag with major.minor version
and remove the v in the tag which it didn't before.
- Fix the CircleCI cron setup.
* Update config.yml
* Use buildkit if possible.
* Use machine executor which supports buildkit.
* Remove setup docker step
* Use newer image.
* Use buildkit syntax for caching pip dependencies.
This should significantly speed up the build process by not having
to build python wheels multiple times.
* Use plain output from buildkit
* Make deploy script work with Python 2.7
Also cache python deps across builds.
* Fix more python3 things
* Install dependency in python3
* Update mailman-web to use Python 3
* Update configuration
* Python 3.6 image.
* Use alpine 3.7
* Use new style middleware
* Use alpine 3.6
* In Python 3, urlparse was renamed to urllib.parse
