Keep redirect_to when hitting the log out AYS.

props mitchoyoshitaka for initial patch.
fixes #17398.

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Remove unused routing code in revisions.

props adamsilverstein.
fixes #26565.

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Add exclude and include to wp_list_authors().

props patricknami.
fixes #9902.

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git-svn-id: http://core.svn.wordpress.org/trunk@27130 1a063a9b-81f0-0310-95a4-ce76da25c4cd
Fix a sometimes notice in wpmu_current_site()

props johnjamesjacoby. see #27003.
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