Use dashicons in header images in the customizer.

props mcsf.
see #21785.

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Fix a typo in the `deleted_{$meta_type}_meta` hook description.

Props aliso.
Fixes #25826.

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Multisite: Lowercase REQUEST_URI when matching paths.

props markjaquith, jeremyfelt.
fixes #26403.

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Network Admin: Case-insensitive comparisons for the network-site comparison in the bootstrap.

props jeremyfelt.
fixes #17168.

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Use Dashicon-style images for mime type icons. Actually moving to Dashicons via the font can be explored later, but has theme/plugin implications and requires too many changes to make it for 3.9. props melchoyce for the icons. fixes #26650.

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Ensure buttons don't get overly tall in responsive views when a browser (oh, Firefox) enforces a line-height on buttons. props azaozz. fixes #27409.

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Autosave: don't create the temporary permalink if the title field had focus (the user was typing a title) at the time of the last autosave. Fixes #27503
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