Bug #26, Update core WordPress from 3.9.1 to 4.0+ [LACE]+

* From: https://github.com/WordPress/WordPress/commit/c462d023ddf12654
* https://github.com/WordPress/WordPress/tree/4.0-branch
* To: https://github.com/WordPress/WordPress/commit/4edbc74e65b4c63
* @nacin, 23 Sep 2014, Add safeguards for when ext/hash is not compiled with PHP* Built from https://develop.svn.wordpress.org/branches/4.0@29761