Prepare Platform.sh configuration files.#5519

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GuGuss wants to merge 5 commits intosymfony:masterfrom

GuGuss:master

Commits on Jul 13, 2015

Prepare Platform.sh configuration files.
GuGuss
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Commits on Jul 14, 2015

Improve configuration files.
GuGuss
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Better Sphinx version.
GuGuss
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Mention Platform.sh on README.
GuGuss
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Document Platform.sh on the contributing section.
GuGuss
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