Adding Symfony4 support#89

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jjmonagas wants to merge 2 commits intodjoos:masterfrom

jjmonagas:feature-symfony4-support

Commits on Nov 18, 2017

Added dependencies for Symfony4 in composer.json
Jose Juan Monagas Santana
committed
Removed the DefinitionDecorator class, replaced by ChildDefinition
Jose Juan Monagas Santana
committed