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

[Debian testing autoremoval watch]

ruby-virtus 1.0.2-1 is marked for autoremoval from testing on 2015-09-22

It (build-)depends on packages with these RC bugs:
795030: ruby-dependor: FTBFS: rspec3 issue: undefined method `color_enabled='
795031: ruby-coercible: FTBFS: rspec3 port needed(?): undefined method `its'