Fixes Resque multi failure on web UI.
Fixes 'undefined method call for Array' if you try to set a hook to an array using assignment operator. This was a regression in 1.23.1
More consistent arg passing across failure backends so the multiple failure backend works.
Updates per pull request, minor style tweaks.
Updating changelog.
Merge pull request #859 from jonhyman/feature/fix-failure

Feature/fix failure