rails3: path proxies to request.path in rails3, which doesn't include query params

Change-Id: I278ac02f4f9f89a4cc11532c85c98f615304f360
Reviewed-on: https://gerrit.instructure.com/30162
Reviewed-by: Cody Cutrer <cody@instructure.com>
Tested-by: Jenkins <jenkins@instructure.com>
Product-Review: Derek DeVries <ddevries@instructure.com>
QA-Review: Derek DeVries <ddevries@instructure.com>