Introduce plugin icons in the installer.

See http://wp.me/p2AvED-2P8 for the announcement and how to implement these.

props tellyworth.
see #28785.

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git-svn-id: http://core.svn.wordpress.org/trunk@29343 1a063a9b-81f0-0310-95a4-ce76da25c4cd
TinyMCE: update to 4.1.4. Changelog: http://www.tinymce.com/develop/changelog/?type=tinymce. Fixes #29310
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git-svn-id: http://core.svn.wordpress.org/trunk@29344 1a063a9b-81f0-0310-95a4-ce76da25c4cd
TinyMCE wpView: prevent errors when pasting multiple non-embeddable URLs, props avryl, fixes #29268
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git-svn-id: http://core.svn.wordpress.org/trunk@29345 1a063a9b-81f0-0310-95a4-ce76da25c4cd
Autosave: prevent setting multiple stale `wp-saving-post-*` cookies when the browser disregards "session cookies" expiration on quit:
- Add expiration time of 24 hours for these cookies.
- Rename them to `wp-saving-post` (no post_id) so there is never more than one cookie per domain.
Fixes #29294.
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git-svn-id: http://core.svn.wordpress.org/trunk@29346 1a063a9b-81f0-0310-95a4-ce76da25c4cd
Export: Add wxr_export_skip_commentmeta filter to match the _postmeta filter.

props cfinke.
fixes #28745.

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git-svn-id: http://core.svn.wordpress.org/trunk@29347 1a063a9b-81f0-0310-95a4-ce76da25c4cd
Plugin compatibility warnings should be red, not green.

props avryl.
fixes #29309.
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git-svn-id: http://core.svn.wordpress.org/trunk@29348 1a063a9b-81f0-0310-95a4-ce76da25c4cd