Freshen up the docs in functions.php. Remove is_admin() check from...

Freshen up the docs in functions.php. Remove is_admin() check from twentytwelve_enqueue_scripts(). Remove function_exists() wrappers from functions that are hooked in. Kill locale.php handling. see #19978.

git-svn-id: https://core.svn.wordpress.org/trunk@19844 1a063a9b-81f0-0310-95a4-ce76da25c4cd