fixed undefined index: 'children'
Merge branch 'hotfix/empty-tree'
fixed depth-related ordering issue in navigation
Merge branch 'hotfix/navigation-tree-sort'
updated composer
cleanup block getValue & getContentData
updated block tests
Merge branch 'hotfix/block-data-indexing'
updated composer
Merge branch 'master' of git://github.com/sulu-cmf/sulu into hotfix/structure-data