Render views polymorphically

* Takes advantage of to_partial_path to render question collection
* Removes Divergent Change smell from surveys/show.html.erb
* Applies Replace Conditional with Polymorphism refactoring

Author: jferris

example_app/app/views/multiple_choice_questions/_multiple_choice_question.html.erb

@@ -0,0 +1,8 @@
+<ol>
+  <% multiple_choice_question.options.each do |option| -%>
+    <li>
+      <%= submission_fields.radio_button :text, option.text, id: dom_id(option) %>
+      <%= content_tag :label, option.text, for: dom_id(option) %>
+    </li>
+  <% end -%>
+</ol>

example_app/app/views/open_questions/_open_question.html.erb

@@ -0,0 +1 @@
+<%= submission_fields.text_field :text %>

example_app/app/views/questions/_question.html.erb

@@ -0,0 +1,8 @@
+<ol>
+  <% scale_question.steps.each do |step| -%>
+    <li>
+      <%= submission_fields.radio_button :text, step %>
+      <%= submission_fields.label "text_#{step}", label: step %>
+    </li>
+  <% end -%>
+</ol>

example_app/app/views/scale_questions/_scale_question.html.erb

@@ -19,7 +19,12 @@
 <%= simple_form_for [@survey, @completion] do |form| -%>
   <ol>
     <% @questions.each do |question| -%>
-      <%= render 'questions/question', question: question, form: form %>
+      <%= form.fields_for "answers_attributes[#{question.id}]", Answer.new do |submission_fields| -%>
+        <li>
+          <%= submission_fields.label :text, label: question.title %>
+          <%= render question, submission_fields: submission_fields %>
+        </li>
+      <% end -%>
     <% end -%>
   </ol>
   <%= form.submit 'Submit Answers' %>