* config cleanup: remove 'hostpaths' setting entirely, avoiding the need to specify host on which pywb
will run (this was cumbersome to maintain and not really useful)
ReferRedirect just checks that the current request host header, if present, matches that of the referrer
and checks that the coll and script name match.
* removed proxy_pac as it was also unneeded/unused and required use of the hostpaths
* added test for invalid CONNECT usage (405 response)