[DRE-maint] ruby-carrierwave is marked for autoremoval from testing

[Debian testing autoremoval watch]

ruby-carrierwave 0.10.0+gh-4 is marked for autoremoval from testing on 2017-01-01

It (build-)depends on packages with these RC bugs:
591419: ruby-rmagick: librmagick-ruby should not be installable with imagemagick