adding specs for SubjectsController#show
refactoring Subject.find_by_param out of SubjectsController
refactoring NumericalResponse out of SubjectsController
moving Subject#feedback_inputs; add #numerical_responses, #voice_messages
loosen restriction on SubjectsController#index nmerical_responses_exist
adding Question.numerical and attribute specs
refactor SubjectsController
Merge pull request #155 from ohrite/subject_controller

SubjectController refactor