Add ability to not set access_log in vhost.
Add ability to set access_log for ssl vhost.
If you pass undef as an argument to a class or you get the defauilt
value so my idea made no sense.  However, let's leave ssl_access_log
while we're here.
set access_log in ssl vhost to same value as non-ssl vhost unless
ssl_access_log is defined.  Preserves back compatibility this way.
Document ssl_access_log.
Merge pull request #25 from hubspotdevops/vhost_logdir

handle alternative log for SSL vhosts.