Make sure the first revision is seen as coming from emptiness, so it can be restored.

props adamsilverstein. fixes #23898.

git-svn-id: http://core.svn.wordpress.org/trunk@23872 1a063a9b-81f0-0310-95a4-ce76da25c4cd
Sanity checks on image metadata to avoid warnings, etc.

fixes #23733. props wonderboymusic.

git-svn-id: http://core.svn.wordpress.org/trunk@23873 1a063a9b-81f0-0310-95a4-ce76da25c4cd
Since post format meta for images now takes an attachment ID only, make sure we label it appropriately and don't do things like esc_url() the value. fixes #23900.


git-svn-id: http://core.svn.wordpress.org/trunk@23874 1a063a9b-81f0-0310-95a4-ce76da25c4cd
Compress scripts/styles: 3.6-alpha-23875.

git-svn-id: http://core.svn.wordpress.org/trunk@23875 1a063a9b-81f0-0310-95a4-ce76da25c4cd