Clear all transients (regardless of expiration) on all database upgrades. see #20316.

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Twenty Fourteen: prefix Genericons enqueue handle so that the theme uses the its own version of the font CSS. Fixes a few display issues when plugins like Jetpack enqueue a different version of Genericons. See #25085.
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git-svn-id: http://core.svn.wordpress.org/trunk@25342 1a063a9b-81f0-0310-95a4-ce76da25c4cd