Bug #4, I18n - small fixes
Bug #3, Styles in "simple-embed" CSS - SlickQuiz-related
Bug #1, Big fixes to JuxtaLearn Quiz scaffolding

* New, JuxtaLearn_Quiz_Model::get_posts_meta($posts)
* New, *_Scaffold::process_taxonomy($student_problems)
* Mods, *_Scaffold::get_hub_tax_tool()
* Mods, *_Scaffold::ajax_get_student_problems()
* Mods, *_Scaffold::admin_quiz_footer() - Templates
* Mods, *_Api_Helper::json_response() - Pretty print
* Bug fix, *_Model::get_data() - "posts_per_page", not "post_per_page"
* New styles - scaffold.css