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@ohsabry @wvanbergen
The Problem
There was an issue in bundler the causes a NoMethodError (spec undefined for nil:NilClass). It looks like recent versions of ruby on travis are ok, but 1.9.3 needs to update bundler before installing (see this PR for details ~ April 2015).
The Solution
Tell travis to update bundler before installing. I've also cached bundles for faster CI runs (auto updates if the bundle is updated).