Improve API review process

Notes

• API vs header review? Our header review has become an API review – or even an implementation review!
• API design used to be: Go talk with Jasmine; but that doesn't scale. Do we need a group of reviewers?
• How can we get people involved with API design earlier?
  • tooling might help – Daniel has a bot for flagging changes
  • add checks for common mistakes (boolean trap, naming of getters)
  • but tooling won't solve a social issue