Initial content bundle

Conflicts:
	composer.lock
	src/Sylius/Bundle/CoreBundle/Kernel/Kernel.php
	src/Sylius/Bundle/CoreBundle/Resources/config/app/sylius.yml
	src/Sylius/Bundle/FixturesBundle/DataFixtures/PHPCR/LoadPagesData.php
Merge pull request #1489 from pjedrzejewski/content-bundle-poc

Create.js integration and ContentBundle