spree/spree — pull request #4251 by Lordnibbler (2014-01-23 21:16:26+00:00)
Title: Ensure avs_response == 'M' is not considered risky

Addresses mistakenly considering an `avs_response` of `'M'` as risky as pointed out by @radar in https://github.com/spree/spree/pull/4021