Bump the $wp_version.
This version string controls more than you might first imagine, but the important thing to note for now, is that this needs to contain a revision number in order for nightly builds to include a revision number.
If a nightly build doesn't include a revision number, Background Updates won't occur for Development users (after all, 4.1-beta1 == 4.1-beta1, which is already installed).
See #30405

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Use hash_equals() for old md5 hashes.

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Form validation for password resets.

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Playlists are video by default. props duck_

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Fix typo in style filter. props miqrogroove

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Invalidate password keys when a user's email changes.

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TinyMCE: Verify HTML in captions. props azaozz

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Press This: Ensure the error message is printed. props johnbillion

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Better validation of the URL used in core HTTP requests.

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Anchor texturize to shortcodes to improve regex efficiency.

props miqrogroove.
see #29557 for segfault issues.

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Improvements to the output of the new post navigation template functions, including swapping the position of the previous and next links.

See #29808
Props obenland

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Validate image data.

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Customizer: Use deep-links for Backgrounds, Headers, and Widgets.

Replace links in admin menu and toolbar to Custom Background/Header screen with deep-links to the Customizer section.
On the Widgets screen display a link to the Customizer widgets panel.

props topher1kenobe, rzen, celloexpressions, westonruter
fixes #25569, #25571, #28032.
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`grunt autoprefixer` for [30374].

see #29326.
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Simplify selectors in [30374].

props wonderboymusic, adamsilverstein.
see #29326.
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Prevent high resource usage when hashing large passwords. props mdawaffe, pento

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More tests for [30466]. props xknown.

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Twenty Fifteen: bring back the border between post navigation links we lost in the_post_navigation changes.

Props iamtakashi, fixes #30414.


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Correct an SQL syntax error introduced in r30158. Adds tests.

Fixes #30339
See #18962
Props julien731

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WordPress 4.1-beta2

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