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Explicitly added psych to Gemfile for Rubinius, so YAML serialization in delay does not fail.
Note that as of time of writing, 2.1.0 builds are failing on Travis. This is a Travis issue, and doesn't relate to problems in the code. Travis needs to update their images to use Bundler 1.5.1 to address this issue - rubygems/bundler#2780 . According to Twitter Travis is aware and an update is underway.