Skip phases

[DanielCoulbourne]

This PR adds a Verbs::skipPhases() method that causes Verbs not to execute any hooks for one or more phases.

Useful when testing or for certain weird business logic (in our case, ephemeral event queues)

Usage

Verbs::skipPhases(Phase::Apply, Phase::Handle);

This will cause all hooks for the Apply and Handle phases (like the apply() and handle() methods of many events) not to fire.

To reset skipped phases just call the method with no arguments.

Verbs::skipPhases();

[joshhanley]

LGTM. Maybe a way to reset might be helpful?