Update to newest version of Wordpress, containing security fixes.

It contains 9 bugfixes and 5 security fixes:

* Potential authentication cookie forgery. CVE-2014-0166.
* Privilege escalation: prevent contributors from publishing posts. CVE-2014-0165.
* (Hardening) Pass along additional information when processing pingbacks to help hosts identify potentially abusive requests.
* (Hardening) Fix a low-impact SQL injection by trusted users.
* (Hardening) Prevent possible cross-domain scripting through Plupload, the third-party library WordPress uses for uploading files.

(morr)