updates progress bar accuracy

The progress bar now accounts for live coders that have opted for
"finish later"

Address part of issue #63

app/models/candidate.rb

@@ -18,6 +18,7 @@ class Candidate < ApplicationRecord
 
   def answered_questions
     answers.where.not(answer: nil)
+           .where("answers.answer not like '%later:%'")
   end
 
   def fetch_question qid
@@ -25,12 +26,15 @@ class Candidate < ApplicationRecord
   end
 
   def my_quiz
-    CandidateQuiz.new(id).build_my_quiz
+    @candidate_quiz ||= CandidateQuiz.new(id).build_my_quiz
+  end
+
+  def my_status
+    @candidate_status ||= QuizStatus.new(self)
   end
 
   def status
-    # TODO: quiz status: not started, started, completed
-    "--"
+    "#{my_status.progress}%"
   end
 
   def complete!