feature #706 Updated the project to Symfony 4.0 RC2 (javiereguiluz)
feature #706 Updated the project to Symfony 4.0 RC2 (javiereguiluz)

This PR was squashed before being merged into the master branch (closes #706).

Discussion
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Updated the project to Symfony 4.0 RC2

Commits
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087a179 Updated the project to Symfony 4.0 RC2

yceruto/symfony-demo,javiereguiluz/symfony-demo,yceruto/symfony-demo,symfony/symfony-demo,voronkovich/symfony-demo,TomasVotruba/symfony-demo,symfony/symfony-demo,Codeception/symfony-demo,Codeception/symfony-demo,Codeception/symfony-demo,symfony/symfony-demo,javiereguiluz/symfony-demo,voronkovich/symfony-demo,bocharsky-bw/symfony-demo,voronkovich/symfony-demo,bocharsky-bw/symfony-demo,TomasVotruba/symfony-demo,bocharsky-bw/symfony-demo,yceruto/symfony-demo,javiereguiluz/symfony-demo,TomasVotruba/symfony-demo