Drop body-only feature and unused validation 'opts'
Major validator API redesign
Remove dead code
Only modify/validate schema if it's not empty
Validators -> Cops
ValidatorStack -> Cops module
Validator#validate to Cop#investigate
Easier Cop registration
Custom cop sample
Cops issue citations, not results
Cops perform investigations, not validations
Merge pull request #131 from thoughtworks/cops

Replace validator middleware stack with Cop plugins
Obsoletes #91 (no more "body_only" option, but you can change the active cops to only include body validators)