Better error messaging on install.php. props DrewAPicture, ocean90. fixes #24982.

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Live network counts of users and sites for small networks.

props adamsilverstein, jeremyfelt.
fixes #22917.

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Only show top-level items when adding pages to a User's First Nav Menu. (This is also the title of Dave's first children's book.)

props lessbloat.
fixes #25122.

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Twenty Fourteen: change the background color a bit more on hover for main navigation submenus. See #25220.
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Twenty Fourteen: make the content sidebar optional and alter the layout to full-width if the sidebar is not active, but without adding wider featured image (for now). Props iamtakashi, closes #25031.
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Twenty Eleven: update code comments to reflect WP inline docs standards. Props DrewAPicture, see #25256.

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Twenty Twelve: simplify header image check, props obenland. Closes #25400.
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