WPORG_Admin_Extras first-run. Lacks saving logic.
Register, localize, enqueue the currently-empty JS file, other minor adjustments.
Attach button becomes a button-link, passes nonce along for toggle-ability.
Initial AJAX handler for pulling the ticket info.
s/Meta/Core.
Rework the attach/detach buttons into two separate actions.
Minor cleanup.
Register meta, clean up the enqueue logic.
Register parsed content meta, handle toggling UI items on and off based on saved meta.
Textdomain all the strings.
Append the HTML link instead of just the ticket title in the handler response.
Integrate the excerpt into the parsed content area.
Require a Trac ticket number to edit parsed short and long descriptions.
Fix archive title filtering to use specified post
Add breadcrumb to code reference landing page (otherwise there is no link to front page)
Various style improvements via samuelsidler:

* Fix padding on homepage
* Clean up handbook sidebar a bit, per mockup
* Open Sans the things, per mockup (and cleared with Siobhan)
* Handbook style changes including sidebar, topics box, and headings
Add handbook name header to the top of handbook pages
Allow customization of breadcrumb trail item container

* Add config option 'item_container'
* Use 'item_container' to wrap all breadcrumb items
* Allow suppressing 'separator' output by setting its value to false
Use configured handbook name instead of post type label in page titles
Allow for mixed text and code in examples

* Enable shortcode support in comments
* Allow for mixed code and text in examples
* Move functions and handling related to user submitted content into inc/user-content.php
* Add padding around comments