fix custom_log_format_string and set /var/log/nginx permissions
added optional syslog and custom log option
1.1.1 - fix requirements.txt dependency-hell
Depricated role-nginx-vhost, management for multiple vhosts
1.0.4 - fix: https://github.com/blunix/role-nginx/issues/8
1.0.2 - unified Makefile target behaviour for all roles
1.0.1 fixes: - https://github.com/blunix/role-nginx/issues/4