updated composer
Update UPGRADE.md
Abstract Kernel implements SuluKernel
updated translations

Conflicts:
	web/admin/translations/sulu.de.json
	web/admin/translations/sulu.en.json
added widgets to config.yml
moved widgets config to admin
updated dependencies
updated dependencies
added reverse-proxy ttl handling
Updated to latest SearchBundle
fixed overview template
changed navigation interface
Merge branch 'develop' of github.com:sulu-cmf/sulu-standard into feature/performance

Conflicts:
	composer.lock
Merge branch 'feature/reverse-proxy-ttl' into develop
Merge branch 'develop' of github.com:sulu-cmf/sulu-standard into feature/performance
removed disable request analyzer
updated dependencies
fixed twig function names
Updated massive build bundle to latest
changed name of build target