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https://docs.travis-ci.com/user/languages/ruby/#bundler-20
This change downgrades bundler in order to allow installation of the project gems for build. Example of a successful build with this change here.
Additionally, I was seeing errors installing ruby-1.9.3 which is not listed in Travis' list of precompiled ruby binaries so I updated that version to patch 551 (ruby-1.9.3-p551).