remove mention of #docker-meeting

Docker-DCO-1.1-Signed-off-by: Sven Dowideit <SvenDowideit@home.org.au> (github: SvenDowideit)
please, for the love of Docker, do. not. use. symlinks

Docker-DCO-1.1-Signed-off-by: Sven Dowideit <SvenDowideit@fosiki.com> (github: SvenDowideit)
Merge pull request #3932 from SvenDowideit/no-docker-meeting-channel

remove mention of #docker-meeting
Merge pull request #3987 from SvenDowideit/warn-against-symlinks

please, for the love of Docker, do. not. use. symlinks
docker-ci 0.5.5: Fully dockerize docker-ci. Add build test coverage. Add backup builder.
docker-ci 0.5.6: temporary
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