Avoid bundle clean before caching
I'm not sure cause, but due to the influence of `gem clean`, the expected gem seems not to be installed correctly. In order to avoid a test failure due to this, I fixed that `gem clean` not be executed. Ref: https://github.com/travis-ci/travis-ci/issues/2518#issuecomment-121168856 This is a workaround. If Travis fixes something, please revert this.
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