test cookie querystring and cookie

setting GU_TEST cookie to the value of the ?test querystring parameter for integration testing purposes (e.g. disabling foresee survey)

NOTE: you can't set cookies on localhost so you'll need to use 127.0.0.1 or set up a domain in your hosts file if you want to use this locally

@gklopper @johnduffell @glockett @Shakor 

Will this ensure the value is properly escaped? Otherwise you can really ruin someones day...