Return 1 from get_comment_pages_count() when pagination is disabled.

props obenland.
fixes #17778.

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Avoid a PHP notice in wpmu_create_blog() if $meta is not passed. props duck_, jeremyfelt, SergeyBiryukov. fixes #20793.
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Ignore case differences when checking file extension in wp_audio_shortcode() and wp_video_shortcode(). props nofearinc, bhengh. fixes #25140.
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Twenty Thirteen: Ensure custom headers are set up after the localization is initialized.

props pavelevap.
fixes #24943.

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Improve inline docs for register_post_type() and register_taxonomy().

* register_taxonomy: Use the same doc format for the associative array arg as used for register_post_type()
* register_taxonomy: Improve docs for _builtin, capabilities, hierarchical and rewrite args
* register_taxonomy: Use the same order in $defaults as in docblock
* register_taxonomy: Replace is_null with null ===, to be consistent
* register_post_type: Use the same order in $defaults as in docblock
* register_post_type: Improve docs for @uses and default fallbacks
And while we're on it: Whitespaces.

fixes #25150.
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Press This: Add admin_head-like hooks that are specific to the page.

props sillybean.
fixes #18843.

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TinyMCE: fix editor focus issues after ontouchstart event on the parent document in iOS Safari. Fixes #25131 for 3.7.
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Introduce show_in_menu for register_taxonomy.

Accepts boolean: true to show, false to hide. If not set, the default is inherited from show_ui.

fixes #20930.
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