Can't use Cramp in Gemfile

[pboettcher]

Cramp gem is installed separately fine, but when included into Gemfile, bundle install and bundle update fail.

For verbose description please look here: http://stackoverflow.com/questions/23246210/strange-errors-when-doing-bundle-install-with-cramp

[lucasallan]

@pboettcher I'll take a look. Thank you.