[Security] Hidden front controller for Nginx#4295

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phansys wants to merge 3 commits intosymfony:masterfrom

phansys:hide_front_controller

Commits on Oct 4, 2014

For Nginx in PROD env, this makes more difficult to know that app is running Symfony.
phansys
committed

Commits on Oct 6, 2014

* Replaced IF statement by "internal" directive.
phansys
committed

Commits on Nov 3, 2014

Updated docblock for config in DEV environment.
phansys
committed