Fail the build when gem dependencies are missing rather than attempting to
install the dependencies
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Key: BUILDR-602
URL: https://issues.apache.org/jira/browse/BUILDR-602
Project: Buildr
Issue Type: Improvement
Reporter: Peter Donald
With "BUILDR-601 Remove Buildr::Util::Gems" it is no longer possible to install
gems so instead we fail the build with a warig.
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