fix for "Error during failsafe response: private method `status_code' ca...

fix for "Error during failsafe response: private method `status_code' called for #<ActionDispatch::ExceptionWrapper:0x...>"

The above error is dumped to the log whenever a backtrace is dumped to the log for an app that uses will_paginate along with a Rails 3.2 and Hobo 1.4.

Hobo 1.4 never uses ExceptionWrapper or status_code; I'm not sure why it brings out this behaviour in Rails.  Regardless, status_code is public in Rails, so bringing it private is probably not a good idea.