Twenty Thirteen: remove all `post_format_*()` and `the_remaining_content()` function calls, reverting to `the_content()`. Simplify functions.php, JS, and CSS files accordingly. Props obenland for starter patch, fixes #24469 and #24407. See #24452.

git-svn-id: https://core.svn.wordpress.org/trunk@24391 1a063a9b-81f0-0310-95a4-ce76da25c4cd