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

[Debian testing autoremoval watch]

ruby-carrierwave 0.10.0+gh-1 is marked for autoremoval from testing on 2015-09-28

It (build-)depends on packages with these RC bugs:
795609: ruby-sham-rack: FTBFS: /usr/bin/ruby2.1 /usr/bin/rspec --pattern ./spec/\*\*/\*_spec.rb failed
795663: ruby-timecop: FTBFS under some timezones