Merge pull request geerlingguy#8 from teampants/master

Remove elasticsearch dependency

PR geerlingguy#9 follow-up: Add note about file pathing for certs.

Update to nginx log filter.

Add EL 7 to supported platforms.

Updates for better cross-platformness.

Use proper permissions.

Update description.

Make Logstash work with RedHat/CentOS.

Use actual working logstash-forwarder lumberjack configuration.

Start Logstash and enable on boot.