Automatically esc_url() the URL echoed by the_permalink().

This makes the_permalink() useful, rather than needing to do `echo esc_url( get_permalink() )` to get proper encoding of ampersands, etc. This will not double-encode when esc_url() has already been applied to the filter here, but that code can now be removed.

props mfields.
fixes #17562.



git-svn-id: https://core.svn.wordpress.org/trunk@23527 1a063a9b-81f0-0310-95a4-ce76da25c4cd
esc_url() when printing a URL into an attribute, even when it is known to be safe. (see #17562)



git-svn-id: https://core.svn.wordpress.org/trunk@23528 1a063a9b-81f0-0310-95a4-ce76da25c4cd
Make Twenty Thirteen the default theme.

Has the added benefit of ensuring the WordPress Beta Tester plugin allows updates of Twenty Thirteen.

props JustinSainton.
fixes #23573.



git-svn-id: https://core.svn.wordpress.org/trunk@23529 1a063a9b-81f0-0310-95a4-ce76da25c4cd