Simplify code example in "Adding custom extensions" section#5962

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snoek09 wants to merge 5 commits intosymfony:2.3from

snoek09:simplify-adding-custom-extensions-code

Commits on Dec 5, 2015

simplify code example as suggested by @webmozart and @stof
Henry Snoek
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Revert "simplify code example as suggested by @webmozart and @stof"
Henry Snoek
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simplify code example as suggested by @webmozart and @stof
Henry Snoek
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fix missing semicolon
Henry Snoek
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Commits on Dec 6, 2015

example should work with php version < 5.5
Henry Snoek
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