Add route to get iteration comments for specific line number.
Add comments controller action to get comments for specific iteration line.
Show annotations when clicking line number on iteration.
Touch comments_for_iteration_line view.
Add score method to votable methods module.
Add default scope to comment for non-annotation comments (where line_number is nil).
Set user_id to current user's id in comment create action.
Add active_model_serializers gem.
Add comment serializer with score attribute.
Remove default scope and add separate scopes for comments and annotations.
Remove root key in comments JSON rendering.
Show non-annotation comments when showing snippets.
Fix authenticity token value when creating new annotation.
Smoothen first-time animation on annotationbar reveal.