Yoast SEO 1.4.18

October 30, 2013

Unhooking 'shutdown' (part of the NGG fix in 1.4.16) caused caching plugins to break, fixed while preserving NGG fix.
These changes were pushed in later but were deemed not important enough to force an update:
Updated newsletter subscription form to reflect new newsletter system.
Documentation
Updated readme.txt to reflect support changes.
Moved old sections of changelog to external file.
i18n
Updated pt_PT