enable enforce_policy_use to be disabled via a configuration setting

[barelyknown]

At the very least, this would be helpful in conjunction with the :permitted shared context requested in this issue: #8. But, I can imagine that there may be other uses too.

[alyssais]

This could be done with skip_after_action :enforce_policy_use.

Do you think it would be enough to document that, or does there need to be an extra setting?

[barelyknown]

Yeah, good point. That should work fine.

[alyssais]

Reopening to remind me to document it.