serveSnaplet now uses httpServe

simpleHttpServe does not setup reverse proxy, this makes serveSnaplet
unusable behind proxy. Though user can add behindProxy combinator
to his routes, routes installed by snaplets, like heist will not work
properly.
Merge pull request #127 from sopvop/serveSnaplet

serveSnaplet should use httpServe
Set proper path of remember cookie when expiring

Same path as used in setSecureCookie