Updates: When a failed Background Update occurs, only show the failed update nag if the user hasn't yet updated if it was an early abort. Props SergeyBiryukov. Fixes #25887 for trunk

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Invalidate the 'update_core' Update check transient when $wp_version changes. See #25831

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Don't call is_home() before the query is run in Featured Content's pre_get_posts hook callback.


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Twenty Fourteen: remove unneeded translator context from theme Help tab text, props domain. See #25837.
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Don't place smilies inside of pre or code tags. Don't skip smilie after a smilie with an 8 in it. Fix regular expression used for smiley translations to work when there is only one registered emoticon.

Props solarissmoke, soulseekah, mdbitz, yonasy. ht to mdbitz for the Unit Tests and a comprehensive patch.
Fixes #16448, #20124, #25303.


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