After installation of crate (0.1.1) gem, doing:

crate -v

raised an exception after not being able to find logging functionality:

$ crate -v
D:/Users/Luis/ruby/ruby-186-p114-MINGW-rubygems-130/lib/ruby/site_ruby/1.8/rubygems/custom_require.rb:27:in
`gem_original_require': no such file to load -- logging (LoadError)
        from D:/Users/Luis/ruby/ruby-186-p114-MINGW-rubygems-130/lib/ruby/site_ruby/1.8/rubygems/custom_require.rb:27:in
`require'
        from D:/Users/Luis/ruby/ruby-186-p114-MINGW-rubygems-130/lib/ruby/gems/1.8/gems/crate-0.1.1/lib/crate.rb:7
        from D:/Users/Luis/ruby/ruby-186-p114-MINGW-rubygems-130/lib/ruby/site_ruby/1.8/rubygems/custom_require.rb:27:in
`gem_original_require'
        from D:/Users/Luis/ruby/ruby-186-p114-MINGW-rubygems-130/lib/ruby/site_ruby/1.8/rubygems/custom_require.rb:27:in
`require'
        from D:/Users/Luis/ruby/ruby-186-p114-MINGW-rubygems-130/lib/ruby/gems/1.8/gems/crate-0.1.1/lib/crate/main.rb:1
        from D:/Users/Luis/ruby/ruby-186-p114-MINGW-rubygems-130/lib/ruby/site_ruby/1.8/rubygems/custom_require.rb:27:in
`gem_original_require'
        from D:/Users/Luis/ruby/ruby-186-p114-MINGW-rubygems-130/lib/ruby/site_ruby/1.8/rubygems/custom_require.rb:27:in
`require'
        from D:/Users/Luis/ruby/ruby-186-p114-MINGW-rubygems-130/lib/ruby/gems/1.8/gems/crate-0.1.1/bin/crate:7

Installing logging gem (and it's dependencies) solved the problem.

Checking dependencies in gemspec.rb file confirms the missing dependency:

http://github.com/copiousfreetime/crate/tree/master/gemspec.rb#L22-27