Remove direction for deleting app_dev.php
Remove direction for deleting app_dev.php

This file is no longer present.  I also re-ordered the cache clearing
instructions so the cache warmup wouldn't get wasted by deleting the
cache directory.

stopfstedt/ilios,dartajax/ilios,ilios/ilios,thecoolestguy/ilios,Trott/ilios,stopfstedt/ilios,thecoolestguy/ilios,dartajax/ilios,Trott/ilios,ilios/ilios