understudy-promise

Based on understudy v4.1.0.

Differences

• There is only one argument to the hooks. If you need multiple arguments, pass in arrays or objects. The argument is also passed to the perform function.
• When using waterfall, the result of the before hook function chain is passed down to the perforn function.
• There is no callback to either .perform or .waterfall. They return promises, so use .then and .catch. Errors thrown when there is no .catch are not ignored.
• Additional API for removing hooks: unregister(action, func) to remove a single hook and unregisterAll([action]) to remove many.