Deploy release 1.25 - Githubissues

[x] libhxl-python release 4.25.1 on PyPi (@davidmegginson)
[x] confirm all other issues closed or moved to a different milestone
[x] confirm all hxl-proxy unit tests pass
[x] update version to "1.25" in both setup.py and hxlproxy/__init_\.py
[x] update libhxl requirement in requirements.txt and setup.py to v.4.25.1
[x] confirm CHANGELOG up to date
[x] commit changes
[x] test in clean virtualenv
[x] test Docker build locally: $ sudo docker build --no-cache -t unocha/hxl-proxy:local .
[x] merge to git test branch and push
[x] merge to git master branch and push
[x] add git tag "1.25"
[x] create GitHub release 1.25
[x] create PyPi release: pip install twine && rm -rf dist/* && python setup.py sdist && twine upload dist/*
[x] wait for and verify the 1.25 build on docker hub succeeds: https://hub.docker.com/r/unocha/hxl-proxy/builds/
[x] deploy to staging
[x] test in staging using test links: $ cat tests/browser-tests/staging-urls.txt | xargs -d '\n' firefox (or for macos users: for url in $(cat tests/browser-tests/staging-urls.txt); do open $url; done )
[x] deploy to prod
[x] test in prod using test links: $ cat tests/browser-tests/prod-urls.txt | xargs -d '\n' firefox (or for macos users: for url in $(cat tests/browser-tests/prod-urls.txt); do open $url; done )

HXLStandard / hxl-proxy