updated website app cache kernel & config
Enable app cache only, if environment is not 'dev'
Merge branch 'develop' of github.com:sulu-cmf/sulu-standard into feature/cache-expiration

Conflicts:
	composer.lock
Merge branch 'develop' of github.com:sulu-cmf/sulu-standard into feature/cache-expiration

Conflicts:
	composer.lock
Merge branch 'develop' of github.com:sulu-cmf/sulu-standard into feature/cache-expiration

Conflicts:
	composer.lock
updated app cache handling
Merge branch 'develop' of github.com:sulu-cmf/sulu-standard into feature/cache-expiration
updated web
merged with develop
Merge branch 'develop' of github.com:sulu-cmf/sulu-standard into feature/cache-expiration

Conflicts:
	composer.lock
Merge branch 'develop' of github.com:sulu-cmf/sulu-standard into feature/cache-expiration

Conflicts:
	composer.json
	composer.lock
Merge branch 'feature/cache-expiration' of github.com:sulu-cmf/sulu-standard into feature/cache-expiration

Conflicts:
	composer.lock
disabled cashing for dev mode
Merge pull request #79 from sulu-cmf/feature/cache-expiration

[FEATURE] basic cache expiration