Allow valuation internal comments to be created

How:

Using a local variable at partials to set a hidden true/false value for
`valuation` parameter on the comment creation form.

Allowing that new param at the comment controller and using it when
building a new Comment.

app/controllers/comments_controller.rb

@@ -45,12 +45,13 @@ class CommentsController < ApplicationController
 
     def comment_params
       params.require(:comment).permit(:commentable_type, :commentable_id, :parent_id,
-                                      :body, :as_moderator, :as_administrator)
+                                      :body, :as_moderator, :as_administrator, :valuation)
     end
 
     def build_comment
       @comment = Comment.build(@commentable, current_user, comment_params[:body],
-                               comment_params[:parent_id].presence)
+                               comment_params[:parent_id].presence,
+                               comment_params[:valuation])
       check_for_special_comments
     end