Fix EZP-25479: better support for nginx in front of varnish#93

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gggeek wants to merge 3 commits intoezsystems:masterfrom gggeek:EZP-25479

+30-10

Commits on Feb 17, 2016

Fix EZP-25479: better support for nginx in front of varnish
gggeek
committed

Commits on Mar 28, 2016

Simplify management of X-Forwarded-for header; take into account the presence of a reverse proxy when sending debug headers
gggeek
committed
Port latest changes to vcl v3 and improve docs
gggeek
committed