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

[Debian testing autoremoval watch]

ruby-carrierwave 0.10.0+gh-2 is marked for autoremoval from testing on 2016-03-10

It (build-)depends on packages with these RC bugs:
812736: ruby-net-ssh: FTBFS: /usr/lib/ruby/2.2.0/rubygems/specification.rb:927:in `block in find_by_path': undefined method `contains_requirable_file?' for nil:NilClass (NoMethodError)