Initialization of sub-components moved from ComponentContainer to ComponentTreeController.
Refactored explorer and editor acording to init changes.
Merge pull request #165 from kormik/feature/backend

Feature/backend
Method Document::getChildDocuments() now accept Folder instead of Document.
Fixed tree template.
Updated exception messsage.
Added TranslatorAwareInterface and add translation to Finder.
Merge remote-tracking branch 'v2/feature/backend' into feature/backend-delete
Delete, Copy, Move - wip
Delete, Copy, Move - business methods - wip