minor #718 Adds Doctrine's mapping validation on Travis. (phpeek)
minor #718 Adds Doctrine's mapping validation on Travis. (phpeek)

This PR was merged into the master branch.

Discussion
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Adds Doctrine's mapping validation on Travis.

Runs `doctrine:schema:validate` command with database sync skipping and
no interaction flags.

This is what I usually setup in CI for my projects to avoid common Doctrine's mapping errors e.g. missing `inversedBy` properties.

Commits
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2faf341 Adds Doctrine's mapping validation on Travis.

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