Release Guide for Amber

The following steps are required to make a release of Amber:

check that all tests are green
check that the examples are up-to-date
check that API-CHANGES.txt is up-to-date; remove the 'work in progress' from version
check the CHANGELOG file and update the release notes, check the milestone index in issues link
log in to npm with write access for the Amber package
execute internal/release.sh
answer the question about the version number used for the release
answer the question about the version number for the upcoming release
merge the created tag into the stable branch
update the homepage to point to the latest tag on GitHub
send announcement to mailinglists (Amber, Pharo, what else?)
send announcement on Twitter
send announcement on G+