#8 removed redundant headers.html
#7: added custom datetime serializer
#12: added method for fetching course plan dtos; splited content into filename and description in UI
#10: Added Module to DtoFactoryService and updated the controller
#8: added module grid
#10: Added Chapter, Lesson and Quiz to DtoFactoryService and updated the controllers
#7: added chapter grid; fixed indentation in directives
#7: added messages grid
Added defaultURL, forms for creating new elements are now expanded by default
#10: Added quizzes grid, updated DtoFactoryService