Fix SlideShare oEmbed regex.

props kovshenin.
fixes #28380.
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Twenty Fourteen: Avoid passing an empty string to document.getElementById().

props nabil_kadimi.
fixes #28340.
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Display Dashboard icon instead of the home icon in toolbar when the link leads to Dashboard.

props ghost1227.
fixes #26754.
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Fix displaying taxonomies in bulk edit if the post type does not support titles.

props scribu.
fixes #16793.
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Revert [28579] and [28582]. see #21963.

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