refactored structure extensions
Merge branch 'develop' of git://github.com/sulu-cmf/sulu into feature/simple-structure
fixed all test cases
Merge branch 'feature/content-type-debug' of git://github.com/sulu-cmf/sulu into feature/simple-structure
Merge branch 'develop' of git://github.com/sulu-cmf/sulu into feature/simple-structure
cleaned code
Merge branch 'feature/simple-structure' into develop
filtered null value
Merge branch 'develop' of git://github.com/sulu-cmf/sulu into develop
Merge branch 'develop' of git://github.com/sulu-cmf/sulu into feature/shadow-pages