Twenty Thirteen: adjust background size of header image(s) for small devices. Props senlin, fixes #26856.
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Twenty Twelve: bump JS version after r28700 change. See #24767.
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git-svn-id: http://core.svn.wordpress.org/trunk@28519 1a063a9b-81f0-0310-95a4-ce76da25c4cd
Properly indicate with the cursor that the editor can be vertically resized using the entire info bar, not just the handle displayed in the corner.

props torresga. fixes #28420.

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