implemented content mapper extensions
implemented structure extensions
added tests and fixed bugs
implemented save extension
fixed service config
Merge branch 'develop' of git://github.com/sulu-cmf/sulu into feature/structure-extensions
implemented dynamically add extensions to structure
added tag and service id
added clone service
added helper functions
fixed test class names
cleaned code
Merge branch 'develop' of git://github.com/sulu-cmf/sulu into feature/structure-extensions
Merge branch 'feature/structure-extensions' into develop