adjust domain.question
add ctor parameter.
add test code.
genetic algothrim init.
ignore .userprefs
add cross operator.
init implementation for GA.
adjust project structure.
domain adjustment.
partial domain logic implementation.
add url pattern file. tuning service.
update git ignore file.
random examination paper generation service implementation.
implemented ExaminationService.
answering service implementation.
format AnsweringService
cleanup solution.
reformat code.
add missing files.
adjust service implementation. close website pre-compilation.