Fix Test id on creating from WP_Post
Setup TestPasser to render on single template inside content

* Use 'single_template' and 'the_content' filters
* Move 'save_post' action inside TestEditor
* Add addFilter and getQuery into WordpressFacade
Move all doers under Doer
Standardize template rendering

* Use $action-$something naming
* Allow to pass full path to render
Render test fill form action
Merge branch 'issue/render-test-page' into develop