Update AuthakeComponent.php

> first attempt at fixing broken previousURL functions

This will add limited support for previousURL to work for returning to a previous request's record Id after login for simple CRUD actions. This does not support named arguments. It will try to append the first extraneous parameter's value to the previousURL only, which is enough for my purposes. 

I have only been tested minimally. Would appreciate your input. cleanURL is used in other places for other purposes so I avoided modifying it.

- js