[Merge] lp:~ubuntu-mate-dev/debian-cd/ubuntu-mate-base into lp:~ubuntu-cdimage/debian-cd/ubuntu

[Martin Wimpress]

This merge proposal adds support for Xubuntu Base and Ubuntu MATE Base as discussed with Adam Conrad. The "Base" variants contain a minimal desktop environment suitable for experienced user to craft their own setup.
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https://code.launchpad.net/~ubuntu-mate-dev/debian-cd/ubuntu-mate-base/+merge/284435
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