Revisions: Cleanup, bug fixes, refactoring, polish.

* Hide the tooltip initially.
* Fix a bug with routing.
* Further separate the Slider model and view, refactoring its code.
* More reliance on events than direct calls between areas.
* Smarter background diff loading (single mode). Loads the diffs closest to your position first.
* Removed a bunch of manual templating and `render()` methods. Now relies more on the WP Backbone Views functionality.
* include the requested `id` in `ensure:load`.
* new trigger: `ensure`, for `ensure()` attempts, regardless of whether they are already loaded.
* pass along a promise in both `ensure` and `ensure:load`.
* in `ensure`, remove requests for diffs we aready have

See #24425.

git-svn-id: http://core.svn.wordpress.org/trunk@24671 1a063a9b-81f0-0310-95a4-ce76da25c4cd
Compress scripts/styles: 3.6-beta4-24672.

git-svn-id: http://core.svn.wordpress.org/trunk@24672 1a063a9b-81f0-0310-95a4-ce76da25c4cd
Revisions: Use all the vendor prefixes for box-sizing.

See #24425.

git-svn-id: http://core.svn.wordpress.org/trunk@24673 1a063a9b-81f0-0310-95a4-ce76da25c4cd
Remove 'sorted' from do_accordion_sections(). fixes #23450.



git-svn-id: http://core.svn.wordpress.org/trunk@24674 1a063a9b-81f0-0310-95a4-ce76da25c4cd
Revisions: Tweak the slider image and alignment.

See #24425.

git-svn-id: http://core.svn.wordpress.org/trunk@24675 1a063a9b-81f0-0310-95a4-ce76da25c4cd
Compress scripts/styles: 3.6-beta4-24676.

git-svn-id: http://core.svn.wordpress.org/trunk@24676 1a063a9b-81f0-0310-95a4-ce76da25c4cd
Revisions: pixel perfect tooltips (as far as I can tell), and better checkbox alignment in Firefox.

See #24425.

git-svn-id: http://core.svn.wordpress.org/trunk@24677 1a063a9b-81f0-0310-95a4-ce76da25c4cd
Revisions: Have the tooltip follow the "from" scrubber handle when that is the one being moved, in compare-two mode.

See #24425.

git-svn-id: http://core.svn.wordpress.org/trunk@24678 1a063a9b-81f0-0310-95a4-ce76da25c4cd
Revisions: Code and whitespace cleanup.

See #24425.

git-svn-id: http://core.svn.wordpress.org/trunk@24679 1a063a9b-81f0-0310-95a4-ce76da25c4cd
Tweaks to the accordion:

* Enqueues JS in `do_accordion_sections()`.
* Top and bottom rounded corners for the nav menu accordion.
* Better RTL and no-JS.

props lessbloat, DrewAPicture, aaroncampbell, helen. fixes #23449.


git-svn-id: http://core.svn.wordpress.org/trunk@24680 1a063a9b-81f0-0310-95a4-ce76da25c4cd
Compress scripts/styles: 3.6-beta4-24681.

git-svn-id: http://core.svn.wordpress.org/trunk@24681 1a063a9b-81f0-0310-95a4-ce76da25c4cd
Simplify and reduce the new media/content extraction functions.

The URL extraction function is now get_url_in_content(). For more, see #24202.

Also adds filters to get_post_galleries() and get_post_gallery(). fixes #24309.



git-svn-id: http://core.svn.wordpress.org/trunk@24682 1a063a9b-81f0-0310-95a4-ce76da25c4cd
Move get_url_in_content() out of post-formats.php. see #24202.



git-svn-id: http://core.svn.wordpress.org/trunk@24683 1a063a9b-81f0-0310-95a4-ce76da25c4cd
Add types parameter to get_media_embedded_in_content(). props aaroncampbell. see #24202.



git-svn-id: http://core.svn.wordpress.org/trunk@24684 1a063a9b-81f0-0310-95a4-ce76da25c4cd
Drop get_images_in_content() and get_image_in_content(), until recently get_content_image(s)(). fixes #24202.



git-svn-id: http://core.svn.wordpress.org/trunk@24685 1a063a9b-81f0-0310-95a4-ce76da25c4cd
Revisions: more graceful tooltips

* Use hoverIntent to prevent inadvertent display and provide more forgiving exploration.
* Nice interruptable fading animation.
* Subtle CSS transition when moving the tooltip side-to-side.

Fixes #24734. See #24425.

git-svn-id: http://core.svn.wordpress.org/trunk@24686 1a063a9b-81f0-0310-95a4-ce76da25c4cd
Avoid empty header color after enabling header text via Customizer. props obenland, fixes #23761.



git-svn-id: http://core.svn.wordpress.org/trunk@24687 1a063a9b-81f0-0310-95a4-ce76da25c4cd
Revisions: force a scroll bar so that everything doesn't jerk around as you scrub due to the scroll bar popping in and out.

See #24425.

git-svn-id: http://core.svn.wordpress.org/trunk@24688 1a063a9b-81f0-0310-95a4-ce76da25c4cd
Revisions: Disable URL updating if a browser doesn't support the History API. Like IE < 10.

props markjaquith. see #24736.

git-svn-id: http://core.svn.wordpress.org/trunk@24689 1a063a9b-81f0-0310-95a4-ce76da25c4cd
Compress scripts/styles: 3.6-beta4-24690.

git-svn-id: http://core.svn.wordpress.org/trunk@24690 1a063a9b-81f0-0310-95a4-ce76da25c4cd