Implemented rolling release support:

- Now basing on image 'kdelfour/supervisor-docker'
    - Cron script will check and update TT-RSS and all plugins on a daily basis automatically
    - SSL/TLS encryption is off by default so that TT-RSS is running on port 80 by default now
    - SSL/TLS can be enabled with setting "-e TTRSS_SSL_ENABLED=1"
    - A lot of cleanups

service-ttrss-update.conf

@@ -0,0 +1,4 @@
+[program:ttrss-daemon]
+command=/usr/bin/php /var/www/ttrss/update_daemon2.php
+user=www-data
+redirect_stderr=true