Steps to release a new version

Change version in setup.py and troposphere/__init__.py
Update CHANGELOG.md with changes made since last release
Create a signed tag: git tag --sign -m "Release 1.1.1" 1.1.1
Create PyPI release: python setup.py sdist upload --sign
Push commits: git push
Push tag: git push --tags
Update github release page: https://github.com/cloudtools/troposphere/releases

Helper to create CHANGELOG entries

git log --reverse --pretty=format:"%s" | tail -100 | sed 's/^/- /'

grep -h 'resource_type = "AWS::' troposphere/* | sed 's/[ ]*resource_type = "'// | cut -f1-3 -d: | sort | uniq | sed 's/^/- /'