Twenty Thirteen: remove unneeded "structured" post formats `add_theme_support()` declaration. Fixes #24109.

git-svn-id: http://core.svn.wordpress.org/trunk@24151 1a063a9b-81f0-0310-95a4-ce76da25c4cd
Twenty Thirteen: account for `alignnone` images that are inserted into a post on the same line. Give 'em a bit of space. Closes #24238.

git-svn-id: http://core.svn.wordpress.org/trunk@24152 1a063a9b-81f0-0310-95a4-ce76da25c4cd