Add a config setting to generate Javascript nonces

[michaelwignall]

I'm currently working on an application which requires javascript tags to have a nonce set. It's possible to run rake commontator:copy:views and adjust the views to change

<script type="text/javascript">
  <%= render partial: 'commontator/threads/hide_show_links.js', locals: { thread: thread } %>
</script>

to

<%= javascript_tag nonce: true do %>
  <%= render partial: 'commontator/threads/hide_show_links.js', locals: { thread: thread } %>
<% end %>

But it would be nice if this behavior could be controlled by a config value as it means I wouldn't have to copy the views into my app to make this change.