Post Formats: Change post screen icon on selection. props markjaquith. fixes #24140.

git-svn-id: http://core.svn.wordpress.org/trunk@24039 1a063a9b-81f0-0310-95a4-ce76da25c4cd
Revisions JS: Fix typo. props westi . fixes #24136.

git-svn-id: http://core.svn.wordpress.org/trunk@24040 1a063a9b-81f0-0310-95a4-ce76da25c4cd