seperate gets and posts routes
rename next_id in next_user_id
adding one test to test directly next_session_id method
removing return in next_user_id
rename file test one_question_with_two_attendee.rb
renaming Poll tests
removing find_all in Poll, because in Presentation now
moving global evaluation method from Poll to Presentation
moving js an css files to public folder instead of views
removing spare lines
adding public files (js and css) to public folder