Improve documentation

Output logs and errs into temp files:

echo "show errors" | sudo socat unix-connect:/run/haproxy/admin.sock stdio >> /tmp/myhapshowerrs.out 2> /tmp/myhapshowerrs.err

Configure HaProxy together with Varnish

• http://blog.haproxy.com/2015/05/06/haproxys-load-balancing-algorithm-for-static-content-delivery-with-varnish/
• http://blog.haproxy.com/2012/08/25/haproxy-varnish-and-the-single-hostname-website/

What's new in Version 1.6

• http://blog.haproxy.com/2015/10/14/whats-new-in-haproxy-1-6/