Allow mappings to be supplied as array of hashes. #934
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This is a rebase of #698, also updated to follow Rubocop's enforced conventions. It passes tests, but I don't use this feature, and haven't done any work to verify that it works as expected.
Given that the module doesn't support Ruby 1.8.7 anymore, it might also be possible to fix this in a different way (just going off @btisdall's comment).