Prevent menu items with '0' label from being removed on menu saving. props MikeHansenMe, kovshenin. fixes #23051.

git-svn-id: http://core.svn.wordpress.org/trunk@24235 1a063a9b-81f0-0310-95a4-ce76da25c4cd
Improvements of Image format dropzone

* Limit drag-drop Image format zone to HTML5 runtime
* Only keep the first file dropped
* Only upload image files
* Fix CSS for the progress bar

props azaozz. see #24291.

git-svn-id: http://core.svn.wordpress.org/trunk@24236 1a063a9b-81f0-0310-95a4-ce76da25c4cd
Compress scripts/styles: 3.6-beta2-24237.

git-svn-id: http://core.svn.wordpress.org/trunk@24237 1a063a9b-81f0-0310-95a4-ce76da25c4cd
Fix handling of '0' as meta_value argument in get_pages(). fixes #20376.

git-svn-id: http://core.svn.wordpress.org/trunk@24238 1a063a9b-81f0-0310-95a4-ce76da25c4cd
Twenty Thirteen: minor CSS fixes for comment spacing and property ordering.

git-svn-id: http://core.svn.wordpress.org/trunk@24239 1a063a9b-81f0-0310-95a4-ce76da25c4cd
Return the requested image size in get_the_post_format_image()

props kovshenin. fixes #24188.

git-svn-id: http://core.svn.wordpress.org/trunk@24240 1a063a9b-81f0-0310-95a4-ce76da25c4cd
Improve regular expressions by using a backreference to match right quote of quote pair when matching attributes.

props kovshenin. see #24225.

git-svn-id: http://core.svn.wordpress.org/trunk@24241 1a063a9b-81f0-0310-95a4-ce76da25c4cd
Revert change to get_post_format() introduced in [24226].

see #24291

git-svn-id: http://core.svn.wordpress.org/trunk@24242 1a063a9b-81f0-0310-95a4-ce76da25c4cd
A better logic check for whether we are looking at a post formats supporting view.

see #24291.

git-svn-id: http://core.svn.wordpress.org/trunk@24243 1a063a9b-81f0-0310-95a4-ce76da25c4cd