Twenty Thirteen: change version compare string to "3.6-alpha" to avoid an error for alpha and beta testers during development. See #23819, props kovshenin.

git-svn-id: http://core.svn.wordpress.org/trunk@23825 1a063a9b-81f0-0310-95a4-ce76da25c4cd
Twenty Ten: improve how gallery image IDs are retrieved for use in the Gallery post format template. Props to obenland for original patch, fixes #23617.

git-svn-id: http://core.svn.wordpress.org/trunk@23826 1a063a9b-81f0-0310-95a4-ce76da25c4cd