This PR was squashed before being merged into the 1.3 branch (closes #1185).

Discussion
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Changed the proposed nginx configuration to mimic Symfony's one

The proposed configuration solves [this 404 error issue](https://github.com/silexphp/Silex-Skeleton/issues/24) when trying to load the web profiler under nginx.

Commits
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7e8157f9 Changed the proposed nginx configuration to mimic Symfony's one