Gender nutralise

Guy is often used when meaning men and woman, but sometimes it only means men. So, to avoid ambiguity, lets switch to something that is clearly gender neutral.
Merge pull request #339 from d0ugal/patch-1

Gender nutralise
Dougal Matthews
Cerberus 0.7 requirements and features.
Docs for new Cerberus 0.7 rules.
fix(links): make use of URL_PROTOCOL in document/resource link