add configuration of Bundler env, default to new behavior #378
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This is designed based on @e2's suggestion in #369. Bundler deprecated
with_clean_env
in 1.12.x and has stopped working for me. This adds the configuration of which method to use when executing the rspec cmd. The new default with be to usewith_original_env
based on the deprecation notice: https://github.com/bundler/bundler/blob/v1.12.5/lib/bundler.rb#L208I'm wondering if this should include an upgrade message for anyone bumping to this version.