Documented the Symfony Console Styles#6017

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javiereguiluz wants to merge 5 commits intosymfony:2.7from

javiereguiluz:document_styleguide

Commits on Dec 15, 2015

Documented the Symfony Console Styles
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Commits on Dec 16, 2015

Fixed issues mentioned by reviewers
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Commits on Dec 18, 2015

Another round of reviews
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Commits on Dec 21, 2015

Minor change for consistency
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Commits on Dec 28, 2015

Added the "versionadded" directive
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