Adds a function and an array to the express response object: log() and _log.
Build up the _log array by calling res.log() with a description and whatever objects to log, Ex:
res.log('User object', res.locals.session.user)
res.log('Session expires', res.locals.session.expires)then call
res.log() with no arguments to return an object { 'reslog' : (_log array as a formatted JSON string) } which can then be passed into a view
res.render('view', res.log())Put {{ reslog }} in the view, like below the footer