Sync index*, config*, kernel and autoload file with Symfony-standard
Sync with Sf-standard 2.2 and enable composer post install/update scripts

Also moves SensioDistributionBundle & SensioGeneratorBundle to dev only, this will probably need some doc changes but might lead to slightly better performance in prod.
Add phpunit.xml.dist file from symfony-standard
Add ScriptHandlers for legacy & prod assets
Update doc to reflect assets being dumped by composer
Update composer deps, use eZ Publish kernel dev-master
Merge branch 'master' into merge_from_sf_standard

Conflicts:
	composer.json
	composer.lock
Merge branch 'master' into merge_from_sf_standard

Conflicts:
	composer.json
	ezpublish/EzPublishKernel.php
	ezpublish/config/config_test.yml
Merge branch 'master' into merge_from_sf_standard

Conflicts:
	ezpublish/EzPublishKernel.php
Merge pull request #34 from ezsystems/merge_from_sf_standard

Implement EZP-20039: Automate install steps in composer post install/update