Revert "Merge pull request #625 from holyketzer/custom-messages"

[Burgestrand]

Reverting this because it's blocking us from making a new release, see: #656 (comment)

Additionally, me and @dgmstuart have backtracked a bit and believe that in case you'd like to use a solution similar to this then you should probably use specialized error classes instead, something similar to this:

UserProjectLimitReachedError = Class.new(Pundit::NotAuthorizedError)

def create?
  raise UserProjectLimitReachedError unless user.has_paid_subscription?
end

All that said, I believe that the reasoning in #654 is sound, and so query methods should strive towards returning truthy/falsy as opposed to raising errors to deal with custom error messages.

[dgmstuart]

LGTM:+1: