(Actually) fix broken RHEL build due to which missing.

Fix broken Ubuntu 14 test by downgrading Docker.

Merge pull request geerlingguy#11 from asabirov/logstash-2

Upgrade Logstash to 2.x

Update docs for PR geerlingguy#7.

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.