Crashes when running against morpher

[solnic]

Workspace/morpher (master) % bundle exec mutant --rspec 'Morpher::Registry' -r morpher
Loading jruby-openssl in a non-JRuby interpreter
Mutant configuration:
Matcher:        #<Mutant::Matcher::Scope cache=#<Mutant::Cache> scope=Morpher::Registry>
Subject Filter: Mutant::Predicate::CONTRADICTION
Strategy:       #<Mutant::Strategy::Rspec level=0>
/Users/solnic/.gem/ruby/1.9.3/gems/mutant-0.3.0/lib/mutant/strategy/rspec.rb:18:in `setup': uninitialized constant Mutant::Strategy::Rspec::StringIO (NameError)

[mbj]

@solnic Thx for report. I still use .rc3 in morpher. Where this crash does not occur. I expect I miss a require in 0.3.0.