Allow XML attributes with colons to be read by kses.

The attribute would still need to be whitelisted to get through the filters.

props jorbin.
fixes #17847.


git-svn-id: https://develop.svn.wordpress.org/trunk@27707 602fd350-edb4-49c9-b593-d223f7449a82
Clarify the return value of wp_generate_tag_cloud().

props SergeyBiryukov, DrewAPicture.
fixes #27487.


git-svn-id: https://develop.svn.wordpress.org/trunk@27708 602fd350-edb4-49c9-b593-d223f7449a82
Gracefully fail in wp_generate_tag_cloud() when emptiness is returned from the tag_cloud_sort filter.

props SergeyBiryukov.
fixes #27413.


git-svn-id: https://develop.svn.wordpress.org/trunk@27709 602fd350-edb4-49c9-b593-d223f7449a82