Revert "Use new error API"
Revert "Use new error API"

This reverts commit 64631520a78bbf74ab277172aaaad559fd8542ac.

csantero/broccoli-persistent-filter,jcope2013/broccoli-persistent-filter,chadhietala/broccoli-persistent-filter,broccolijs/broccoli-filter,rwjblue/broccoli-persistent-filter,stefanpenner/broccoli-persistent-filter,joliss/broccoli-filter